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aff33962 | 1 | /* dnsmasq is Copyright (c) 2000-2015 Simon Kelley |
9e4abcb5 SK |
2 | |
3 | This program is free software; you can redistribute it and/or modify | |
4 | it under the terms of the GNU General Public License as published by | |
824af85b SK |
5 | the Free Software Foundation; version 2 dated June, 1991, or |
6 | (at your option) version 3 dated 29 June, 2007. | |
7 | ||
9e4abcb5 SK |
8 | This program is distributed in the hope that it will be useful, |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | GNU General Public License for more details. | |
824af85b | 12 | |
73a08a24 SK |
13 | You should have received a copy of the GNU General Public License |
14 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
9e4abcb5 SK |
15 | */ |
16 | ||
9e4abcb5 SK |
17 | #include "dnsmasq.h" |
18 | ||
8a9be9e4 | 19 | static struct frec *lookup_frec(unsigned short id, void *hash); |
9e4abcb5 | 20 | static struct frec *lookup_frec_by_sender(unsigned short id, |
fd9fa481 | 21 | union mysockaddr *addr, |
8a9be9e4 SK |
22 | void *hash); |
23 | static unsigned short get_id(void); | |
1a6bca81 | 24 | static void free_frec(struct frec *f); |
9e4abcb5 | 25 | |
00a5b5d4 SK |
26 | #ifdef HAVE_DNSSEC |
27 | static int tcp_key_recurse(time_t now, int status, struct dns_header *header, size_t n, | |
28 | int class, char *name, char *keyname, struct server *server, int *keycount); | |
97e618a0 SK |
29 | static int do_check_sign(struct frec *forward, int status, time_t now, char *name, char *keyname); |
30 | static int send_check_sign(struct frec *forward, time_t now, struct dns_header *header, size_t plen, | |
31 | char *name, char *keyname); | |
00a5b5d4 SK |
32 | #endif |
33 | ||
34 | ||
824af85b | 35 | /* Send a UDP packet with its source address set as "source" |
44a2a316 | 36 | unless nowild is true, when we just send it with the kernel default */ |
29689cfa SK |
37 | int send_from(int fd, int nowild, char *packet, size_t len, |
38 | union mysockaddr *to, struct all_addr *source, | |
50303b19 | 39 | unsigned int iface) |
9e4abcb5 | 40 | { |
44a2a316 SK |
41 | struct msghdr msg; |
42 | struct iovec iov[1]; | |
44a2a316 SK |
43 | union { |
44 | struct cmsghdr align; /* this ensures alignment */ | |
5e9e0efb | 45 | #if defined(HAVE_LINUX_NETWORK) |
44a2a316 SK |
46 | char control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
47 | #elif defined(IP_SENDSRCADDR) | |
48 | char control[CMSG_SPACE(sizeof(struct in_addr))]; | |
49 | #endif | |
50 | #ifdef HAVE_IPV6 | |
51 | char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
52 | #endif | |
53 | } control_u; | |
feba5c1d | 54 | |
44a2a316 SK |
55 | iov[0].iov_base = packet; |
56 | iov[0].iov_len = len; | |
57 | ||
feba5c1d SK |
58 | msg.msg_control = NULL; |
59 | msg.msg_controllen = 0; | |
44a2a316 SK |
60 | msg.msg_flags = 0; |
61 | msg.msg_name = to; | |
62 | msg.msg_namelen = sa_len(to); | |
63 | msg.msg_iov = iov; | |
64 | msg.msg_iovlen = 1; | |
feba5c1d | 65 | |
26128d27 | 66 | if (!nowild) |
44a2a316 | 67 | { |
26128d27 | 68 | struct cmsghdr *cmptr; |
feba5c1d SK |
69 | msg.msg_control = &control_u; |
70 | msg.msg_controllen = sizeof(control_u); | |
26128d27 SK |
71 | cmptr = CMSG_FIRSTHDR(&msg); |
72 | ||
73 | if (to->sa.sa_family == AF_INET) | |
74 | { | |
5e9e0efb | 75 | #if defined(HAVE_LINUX_NETWORK) |
8ef5ada2 SK |
76 | struct in_pktinfo p; |
77 | p.ipi_ifindex = 0; | |
78 | p.ipi_spec_dst = source->addr.addr4; | |
79 | memcpy(CMSG_DATA(cmptr), &p, sizeof(p)); | |
26128d27 | 80 | msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); |
c72daea8 | 81 | cmptr->cmsg_level = IPPROTO_IP; |
26128d27 | 82 | cmptr->cmsg_type = IP_PKTINFO; |
44a2a316 | 83 | #elif defined(IP_SENDSRCADDR) |
8ef5ada2 | 84 | memcpy(CMSG_DATA(cmptr), &(source->addr.addr4), sizeof(source->addr.addr4)); |
26128d27 SK |
85 | msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); |
86 | cmptr->cmsg_level = IPPROTO_IP; | |
87 | cmptr->cmsg_type = IP_SENDSRCADDR; | |
44a2a316 | 88 | #endif |
26128d27 | 89 | } |
26128d27 | 90 | else |
b8187c80 | 91 | #ifdef HAVE_IPV6 |
26128d27 | 92 | { |
8ef5ada2 SK |
93 | struct in6_pktinfo p; |
94 | p.ipi6_ifindex = iface; /* Need iface for IPv6 to handle link-local addrs */ | |
95 | p.ipi6_addr = source->addr.addr6; | |
96 | memcpy(CMSG_DATA(cmptr), &p, sizeof(p)); | |
26128d27 | 97 | msg.msg_controllen = cmptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); |
316e2730 | 98 | cmptr->cmsg_type = daemon->v6pktinfo; |
c72daea8 | 99 | cmptr->cmsg_level = IPPROTO_IPV6; |
26128d27 | 100 | } |
3d8df260 | 101 | #else |
c72daea8 | 102 | (void)iface; /* eliminate warning */ |
44a2a316 | 103 | #endif |
26128d27 | 104 | } |
feba5c1d | 105 | |
ff841ebf SK |
106 | while (retry_send(sendmsg(fd, &msg, 0))); |
107 | ||
108 | /* If interface is still in DAD, EINVAL results - ignore that. */ | |
109 | if (errno != 0 && errno != EINVAL) | |
feba5c1d | 110 | { |
29d28dda | 111 | my_syslog(LOG_ERR, _("failed to send packet: %s"), strerror(errno)); |
29689cfa | 112 | return 0; |
feba5c1d | 113 | } |
29d28dda | 114 | |
29689cfa | 115 | return 1; |
9e4abcb5 | 116 | } |
44a2a316 | 117 | |
28866e95 SK |
118 | static unsigned int search_servers(time_t now, struct all_addr **addrpp, |
119 | unsigned int qtype, char *qdomain, int *type, char **domain, int *norebind) | |
feba5c1d SK |
120 | |
121 | { | |
122 | /* If the query ends in the domain in one of our servers, set | |
123 | domain to point to that name. We find the largest match to allow both | |
124 | domain.org and sub.domain.org to exist. */ | |
125 | ||
126 | unsigned int namelen = strlen(qdomain); | |
127 | unsigned int matchlen = 0; | |
128 | struct server *serv; | |
28866e95 | 129 | unsigned int flags = 0; |
feba5c1d | 130 | |
3be34541 | 131 | for (serv = daemon->servers; serv; serv=serv->next) |
feba5c1d | 132 | /* domain matches take priority over NODOTS matches */ |
3d8df260 | 133 | if ((serv->flags & SERV_FOR_NODOTS) && *type != SERV_HAS_DOMAIN && !strchr(qdomain, '.') && namelen != 0) |
feba5c1d | 134 | { |
28866e95 | 135 | unsigned int sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6; |
feba5c1d | 136 | *type = SERV_FOR_NODOTS; |
feba5c1d | 137 | if (serv->flags & SERV_NO_ADDR) |
36717eee SK |
138 | flags = F_NXDOMAIN; |
139 | else if (serv->flags & SERV_LITERAL_ADDRESS) | |
140 | { | |
141 | if (sflag & qtype) | |
142 | { | |
143 | flags = sflag; | |
144 | if (serv->addr.sa.sa_family == AF_INET) | |
145 | *addrpp = (struct all_addr *)&serv->addr.in.sin_addr; | |
feba5c1d | 146 | #ifdef HAVE_IPV6 |
36717eee SK |
147 | else |
148 | *addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr; | |
feba5c1d | 149 | #endif |
36717eee | 150 | } |
824af85b | 151 | else if (!flags || (flags & F_NXDOMAIN)) |
36717eee SK |
152 | flags = F_NOERR; |
153 | } | |
feba5c1d SK |
154 | } |
155 | else if (serv->flags & SERV_HAS_DOMAIN) | |
156 | { | |
157 | unsigned int domainlen = strlen(serv->domain); | |
b8187c80 | 158 | char *matchstart = qdomain + namelen - domainlen; |
feba5c1d | 159 | if (namelen >= domainlen && |
b8187c80 | 160 | hostname_isequal(matchstart, serv->domain) && |
8ef5ada2 | 161 | (domainlen == 0 || namelen == domainlen || *(matchstart-1) == '.' )) |
feba5c1d | 162 | { |
8ef5ada2 SK |
163 | if (serv->flags & SERV_NO_REBIND) |
164 | *norebind = 1; | |
28866e95 | 165 | else |
feba5c1d | 166 | { |
28866e95 SK |
167 | unsigned int sflag = serv->addr.sa.sa_family == AF_INET ? F_IPV4 : F_IPV6; |
168 | /* implement priority rules for --address and --server for same domain. | |
169 | --address wins if the address is for the correct AF | |
170 | --server wins otherwise. */ | |
171 | if (domainlen != 0 && domainlen == matchlen) | |
36717eee | 172 | { |
28866e95 | 173 | if ((serv->flags & SERV_LITERAL_ADDRESS)) |
8ef5ada2 | 174 | { |
28866e95 SK |
175 | if (!(sflag & qtype) && flags == 0) |
176 | continue; | |
177 | } | |
178 | else | |
179 | { | |
180 | if (flags & (F_IPV4 | F_IPV6)) | |
181 | continue; | |
182 | } | |
183 | } | |
184 | ||
185 | if (domainlen >= matchlen) | |
186 | { | |
187 | *type = serv->flags & (SERV_HAS_DOMAIN | SERV_USE_RESOLV | SERV_NO_REBIND); | |
188 | *domain = serv->domain; | |
189 | matchlen = domainlen; | |
190 | if (serv->flags & SERV_NO_ADDR) | |
191 | flags = F_NXDOMAIN; | |
192 | else if (serv->flags & SERV_LITERAL_ADDRESS) | |
193 | { | |
194 | if (sflag & qtype) | |
195 | { | |
196 | flags = sflag; | |
197 | if (serv->addr.sa.sa_family == AF_INET) | |
198 | *addrpp = (struct all_addr *)&serv->addr.in.sin_addr; | |
feba5c1d | 199 | #ifdef HAVE_IPV6 |
28866e95 SK |
200 | else |
201 | *addrpp = (struct all_addr *)&serv->addr.in6.sin6_addr; | |
feba5c1d | 202 | #endif |
28866e95 SK |
203 | } |
204 | else if (!flags || (flags & F_NXDOMAIN)) | |
205 | flags = F_NOERR; | |
8ef5ada2 | 206 | } |
28866e95 SK |
207 | else |
208 | flags = 0; | |
209 | } | |
210 | } | |
8ef5ada2 | 211 | } |
feba5c1d | 212 | } |
8ef5ada2 | 213 | |
7de060b0 | 214 | if (flags == 0 && !(qtype & F_QUERY) && |
28866e95 | 215 | option_bool(OPT_NODOTS_LOCAL) && !strchr(qdomain, '.') && namelen != 0) |
7de060b0 SK |
216 | /* don't forward A or AAAA queries for simple names, except the empty name */ |
217 | flags = F_NOERR; | |
8ef5ada2 | 218 | |
5aabfc78 | 219 | if (flags == F_NXDOMAIN && check_for_local_domain(qdomain, now)) |
c1bb8504 | 220 | flags = F_NOERR; |
feba5c1d | 221 | |
824af85b SK |
222 | if (flags) |
223 | { | |
224 | int logflags = 0; | |
225 | ||
226 | if (flags == F_NXDOMAIN || flags == F_NOERR) | |
227 | logflags = F_NEG | qtype; | |
228 | ||
1a6bca81 | 229 | log_query(logflags | flags | F_CONFIG | F_FORWARD, qdomain, *addrpp, NULL); |
824af85b | 230 | } |
8ef5ada2 SK |
231 | else if ((*type) & SERV_USE_RESOLV) |
232 | { | |
233 | *type = 0; /* use normal servers for this domain */ | |
234 | *domain = NULL; | |
235 | } | |
feba5c1d SK |
236 | return flags; |
237 | } | |
44a2a316 | 238 | |
824af85b SK |
239 | static int forward_query(int udpfd, union mysockaddr *udpaddr, |
240 | struct all_addr *dst_addr, unsigned int dst_iface, | |
83349b8a | 241 | struct dns_header *header, size_t plen, time_t now, |
613ad15d | 242 | struct frec *forward, int ad_reqd, int do_bit) |
9e4abcb5 | 243 | { |
9e4abcb5 | 244 | char *domain = NULL; |
8ef5ada2 | 245 | int type = 0, norebind = 0; |
9e4abcb5 | 246 | struct all_addr *addrp = NULL; |
28866e95 | 247 | unsigned int flags = 0; |
de37951c | 248 | struct server *start = NULL; |
8a9be9e4 SK |
249 | #ifdef HAVE_DNSSEC |
250 | void *hash = hash_questions(header, plen, daemon->namebuff); | |
251 | #else | |
252 | unsigned int crc = questions_crc(header, plen, daemon->namebuff); | |
253 | void *hash = &crc; | |
254 | #endif | |
255 | unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL); | |
a77cec8d | 256 | unsigned char *pheader; |
8a9be9e4 | 257 | |
00a5b5d4 SK |
258 | (void)do_bit; |
259 | ||
3d8df260 SK |
260 | /* may be no servers available. */ |
261 | if (!daemon->servers) | |
9e4abcb5 | 262 | forward = NULL; |
8a9be9e4 | 263 | else if (forward || (hash && (forward = lookup_frec_by_sender(ntohs(header->id), udpaddr, hash)))) |
9e4abcb5 | 264 | { |
a77cec8d SK |
265 | /* If we didn't get an answer advertising a maximal packet in EDNS, |
266 | fall back to 1280, which should work everywhere on IPv6. | |
267 | If that generates an answer, it will become the new default | |
268 | for this server */ | |
269 | forward->flags |= FREC_TEST_PKTSZ; | |
270 | ||
e0c0ad3b | 271 | #ifdef HAVE_DNSSEC |
dac74312 | 272 | /* If we've already got an answer to this query, but we're awaiting keys for validation, |
e0c0ad3b SK |
273 | there's no point retrying the query, retry the key query instead...... */ |
274 | if (forward->blocking_query) | |
275 | { | |
276 | int fd; | |
a77cec8d SK |
277 | |
278 | forward->flags &= ~FREC_TEST_PKTSZ; | |
279 | ||
e0c0ad3b SK |
280 | while (forward->blocking_query) |
281 | forward = forward->blocking_query; | |
a77cec8d SK |
282 | |
283 | forward->flags |= FREC_TEST_PKTSZ; | |
e0c0ad3b SK |
284 | |
285 | blockdata_retrieve(forward->stash, forward->stash_len, (void *)header); | |
286 | plen = forward->stash_len; | |
287 | ||
a77cec8d SK |
288 | if (find_pseudoheader(header, plen, NULL, &pheader, NULL)) |
289 | PUTSHORT((forward->flags & FREC_TEST_PKTSZ) ? SAFE_PKTSZ : forward->sentto->edns_pktsz, pheader); | |
290 | ||
2b29191e | 291 | if (forward->sentto->addr.sa.sa_family == AF_INET) |
25cf5e37 | 292 | log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, "retry", (struct all_addr *)&forward->sentto->addr.in.sin_addr, "dnssec"); |
e0c0ad3b SK |
293 | #ifdef HAVE_IPV6 |
294 | else | |
25cf5e37 | 295 | log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, "retry", (struct all_addr *)&forward->sentto->addr.in6.sin6_addr, "dnssec"); |
e0c0ad3b SK |
296 | #endif |
297 | ||
298 | if (forward->sentto->sfd) | |
299 | fd = forward->sentto->sfd->fd; | |
300 | else | |
301 | { | |
302 | #ifdef HAVE_IPV6 | |
303 | if (forward->sentto->addr.sa.sa_family == AF_INET6) | |
304 | fd = forward->rfd6->fd; | |
305 | else | |
306 | #endif | |
307 | fd = forward->rfd4->fd; | |
308 | } | |
309 | ||
ff841ebf SK |
310 | while (retry_send( sendto(fd, (char *)header, plen, 0, |
311 | &forward->sentto->addr.sa, | |
312 | sa_len(&forward->sentto->addr)))); | |
e0c0ad3b SK |
313 | |
314 | return 1; | |
315 | } | |
316 | #endif | |
317 | ||
de37951c | 318 | /* retry on existing query, send to all available servers */ |
9e4abcb5 | 319 | domain = forward->sentto->domain; |
824af85b | 320 | forward->sentto->failed_queries++; |
28866e95 | 321 | if (!option_bool(OPT_ORDER)) |
de37951c | 322 | { |
0a852541 | 323 | forward->forwardall = 1; |
3be34541 | 324 | daemon->last_server = NULL; |
de37951c | 325 | } |
9e4abcb5 | 326 | type = forward->sentto->flags & SERV_TYPE; |
de37951c | 327 | if (!(start = forward->sentto->next)) |
3be34541 | 328 | start = daemon->servers; /* at end of list, recycle */ |
9e4abcb5 SK |
329 | header->id = htons(forward->new_id); |
330 | } | |
331 | else | |
332 | { | |
333 | if (gotname) | |
8ef5ada2 | 334 | flags = search_servers(now, &addrp, gotname, daemon->namebuff, &type, &domain, &norebind); |
9e4abcb5 | 335 | |
3a237152 | 336 | if (!flags && !(forward = get_new_frec(now, NULL, 0))) |
feba5c1d SK |
337 | /* table full - server failure. */ |
338 | flags = F_NEG; | |
9e4abcb5 SK |
339 | |
340 | if (forward) | |
341 | { | |
0a852541 SK |
342 | forward->source = *udpaddr; |
343 | forward->dest = *dst_addr; | |
344 | forward->iface = dst_iface; | |
0a852541 | 345 | forward->orig_id = ntohs(header->id); |
8a9be9e4 | 346 | forward->new_id = get_id(); |
832af0ba | 347 | forward->fd = udpfd; |
8a9be9e4 | 348 | memcpy(forward->hash, hash, HASH_SIZE); |
0a852541 | 349 | forward->forwardall = 0; |
ed4c0767 | 350 | forward->flags = 0; |
28866e95 SK |
351 | if (norebind) |
352 | forward->flags |= FREC_NOREBIND; | |
572b41eb | 353 | if (header->hb4 & HB4_CD) |
28866e95 | 354 | forward->flags |= FREC_CHECKING_DISABLED; |
83349b8a SK |
355 | if (ad_reqd) |
356 | forward->flags |= FREC_AD_QUESTION; | |
7fa836e1 SK |
357 | #ifdef HAVE_DNSSEC |
358 | forward->work_counter = DNSSEC_WORK; | |
613ad15d SK |
359 | if (do_bit) |
360 | forward->flags |= FREC_DO_QUESTION; | |
7fa836e1 | 361 | #endif |
613ad15d | 362 | |
28866e95 SK |
363 | header->id = htons(forward->new_id); |
364 | ||
8ef5ada2 SK |
365 | /* In strict_order mode, always try servers in the order |
366 | specified in resolv.conf, if a domain is given | |
367 | always try all the available servers, | |
9e4abcb5 SK |
368 | otherwise, use the one last known to work. */ |
369 | ||
8ef5ada2 SK |
370 | if (type == 0) |
371 | { | |
28866e95 | 372 | if (option_bool(OPT_ORDER)) |
8ef5ada2 SK |
373 | start = daemon->servers; |
374 | else if (!(start = daemon->last_server) || | |
375 | daemon->forwardcount++ > FORWARD_TEST || | |
376 | difftime(now, daemon->forwardtime) > FORWARD_TIME) | |
377 | { | |
378 | start = daemon->servers; | |
379 | forward->forwardall = 1; | |
380 | daemon->forwardcount = 0; | |
381 | daemon->forwardtime = now; | |
382 | } | |
383 | } | |
384 | else | |
de37951c | 385 | { |
3be34541 | 386 | start = daemon->servers; |
28866e95 | 387 | if (!option_bool(OPT_ORDER)) |
8ef5ada2 | 388 | forward->forwardall = 1; |
de37951c | 389 | } |
9e4abcb5 SK |
390 | } |
391 | } | |
feba5c1d | 392 | |
9e4abcb5 SK |
393 | /* check for send errors here (no route to host) |
394 | if we fail to send to all nameservers, send back an error | |
395 | packet straight away (helps modem users when offline) */ | |
396 | ||
397 | if (!flags && forward) | |
398 | { | |
de37951c SK |
399 | struct server *firstsentto = start; |
400 | int forwarded = 0; | |
28866e95 | 401 | |
25cf5e37 SK |
402 | /* If a query is retried, use the log_id for the retry when logging the answer. */ |
403 | forward->log_id = daemon->log_id; | |
404 | ||
797a7afb | 405 | if (option_bool(OPT_ADD_MAC)) |
60b68069 | 406 | plen = add_mac(header, plen, ((char *) header) + daemon->packet_buff_sz, &forward->source); |
28866e95 | 407 | |
ed4c0767 SK |
408 | if (option_bool(OPT_CLIENT_SUBNET)) |
409 | { | |
60b68069 | 410 | size_t new = add_source_addr(header, plen, ((char *) header) + daemon->packet_buff_sz, &forward->source); |
ed4c0767 SK |
411 | if (new != plen) |
412 | { | |
413 | plen = new; | |
414 | forward->flags |= FREC_HAS_SUBNET; | |
415 | } | |
416 | } | |
417 | ||
3a237152 SK |
418 | #ifdef HAVE_DNSSEC |
419 | if (option_bool(OPT_DNSSEC_VALID)) | |
0fc2f313 | 420 | { |
613ad15d SK |
421 | size_t new_plen = add_do_bit(header, plen, ((char *) header) + daemon->packet_buff_sz); |
422 | ||
5b3bf921 SK |
423 | /* For debugging, set Checking Disabled, otherwise, have the upstream check too, |
424 | this allows it to select auth servers when one is returning bad data. */ | |
425 | if (option_bool(OPT_DNSSEC_DEBUG)) | |
426 | header->hb4 |= HB4_CD; | |
613ad15d SK |
427 | |
428 | if (new_plen != plen) | |
429 | forward->flags |= FREC_ADDED_PHEADER; | |
430 | ||
431 | plen = new_plen; | |
0fc2f313 | 432 | } |
3a237152 | 433 | #endif |
a77cec8d | 434 | |
9e4abcb5 SK |
435 | while (1) |
436 | { | |
9e4abcb5 SK |
437 | /* only send to servers dealing with our domain. |
438 | domain may be NULL, in which case server->domain | |
439 | must be NULL also. */ | |
440 | ||
de37951c | 441 | if (type == (start->flags & SERV_TYPE) && |
fd9fa481 | 442 | (type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) && |
b5ea1cc2 | 443 | !(start->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP))) |
9e4abcb5 | 444 | { |
1a6bca81 SK |
445 | int fd; |
446 | ||
447 | /* find server socket to use, may need to get random one. */ | |
448 | if (start->sfd) | |
449 | fd = start->sfd->fd; | |
450 | else | |
451 | { | |
452 | #ifdef HAVE_IPV6 | |
453 | if (start->addr.sa.sa_family == AF_INET6) | |
454 | { | |
455 | if (!forward->rfd6 && | |
456 | !(forward->rfd6 = allocate_rfd(AF_INET6))) | |
457 | break; | |
3927da46 | 458 | daemon->rfd_save = forward->rfd6; |
1a6bca81 SK |
459 | fd = forward->rfd6->fd; |
460 | } | |
461 | else | |
462 | #endif | |
463 | { | |
464 | if (!forward->rfd4 && | |
465 | !(forward->rfd4 = allocate_rfd(AF_INET))) | |
466 | break; | |
3927da46 | 467 | daemon->rfd_save = forward->rfd4; |
1a6bca81 SK |
468 | fd = forward->rfd4->fd; |
469 | } | |
7de060b0 SK |
470 | |
471 | #ifdef HAVE_CONNTRACK | |
472 | /* Copy connection mark of incoming query to outgoing connection. */ | |
473 | if (option_bool(OPT_CONNTRACK)) | |
474 | { | |
475 | unsigned int mark; | |
797a7afb | 476 | if (get_incoming_mark(&forward->source, &forward->dest, 0, &mark)) |
7de060b0 SK |
477 | setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); |
478 | } | |
479 | #endif | |
1a6bca81 | 480 | } |
a77cec8d SK |
481 | |
482 | if (find_pseudoheader(header, plen, NULL, &pheader, NULL)) | |
483 | PUTSHORT((forward->flags & FREC_TEST_PKTSZ) ? SAFE_PKTSZ : start->edns_pktsz, pheader); | |
1a6bca81 | 484 | |
ff841ebf SK |
485 | if (retry_send(sendto(fd, (char *)header, plen, 0, |
486 | &start->addr.sa, | |
487 | sa_len(&start->addr)))) | |
488 | continue; | |
489 | ||
490 | if (errno == 0) | |
9e4abcb5 | 491 | { |
cdeda28f SK |
492 | /* Keep info in case we want to re-send this packet */ |
493 | daemon->srv_save = start; | |
494 | daemon->packet_len = plen; | |
495 | ||
de37951c | 496 | if (!gotname) |
3be34541 | 497 | strcpy(daemon->namebuff, "query"); |
de37951c | 498 | if (start->addr.sa.sa_family == AF_INET) |
3be34541 | 499 | log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff, |
1a6bca81 | 500 | (struct all_addr *)&start->addr.in.sin_addr, NULL); |
de37951c SK |
501 | #ifdef HAVE_IPV6 |
502 | else | |
3be34541 | 503 | log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff, |
1a6bca81 | 504 | (struct all_addr *)&start->addr.in6.sin6_addr, NULL); |
de37951c | 505 | #endif |
824af85b | 506 | start->queries++; |
de37951c SK |
507 | forwarded = 1; |
508 | forward->sentto = start; | |
0a852541 | 509 | if (!forward->forwardall) |
de37951c | 510 | break; |
0a852541 | 511 | forward->forwardall++; |
9e4abcb5 SK |
512 | } |
513 | } | |
514 | ||
de37951c | 515 | if (!(start = start->next)) |
3be34541 | 516 | start = daemon->servers; |
9e4abcb5 | 517 | |
de37951c | 518 | if (start == firstsentto) |
9e4abcb5 SK |
519 | break; |
520 | } | |
521 | ||
de37951c | 522 | if (forwarded) |
824af85b | 523 | return 1; |
de37951c | 524 | |
9e4abcb5 SK |
525 | /* could not send on, prepare to return */ |
526 | header->id = htons(forward->orig_id); | |
1a6bca81 | 527 | free_frec(forward); /* cancel */ |
9e4abcb5 SK |
528 | } |
529 | ||
530 | /* could not send on, return empty answer or address if known for whole domain */ | |
b8187c80 SK |
531 | if (udpfd != -1) |
532 | { | |
cdeda28f | 533 | plen = setup_reply(header, plen, addrp, flags, daemon->local_ttl); |
54dd393f | 534 | send_from(udpfd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), (char *)header, plen, udpaddr, dst_addr, dst_iface); |
b8187c80 SK |
535 | } |
536 | ||
824af85b | 537 | return 0; |
9e4abcb5 SK |
538 | } |
539 | ||
ed4c0767 | 540 | static size_t process_reply(struct dns_header *header, time_t now, struct server *server, size_t n, int check_rebind, |
fe3992f9 SK |
541 | int no_cache, int cache_secure, int bogusanswer, int ad_reqd, int do_bit, int added_pheader, |
542 | int check_subnet, union mysockaddr *query_source) | |
feba5c1d | 543 | { |
36717eee | 544 | unsigned char *pheader, *sizep; |
13d86c73 | 545 | char **sets = 0; |
832af0ba | 546 | int munged = 0, is_sign; |
cdeda28f SK |
547 | size_t plen; |
548 | ||
83349b8a | 549 | (void)ad_reqd; |
982faf40 SK |
550 | (void)do_bit; |
551 | (void)bogusanswer; | |
83349b8a | 552 | |
13d86c73 | 553 | #ifdef HAVE_IPSET |
82a14af5 | 554 | if (daemon->ipsets && extract_request(header, n, daemon->namebuff, NULL)) |
13d86c73 | 555 | { |
82a14af5 SK |
556 | /* Similar algorithm to search_servers. */ |
557 | struct ipsets *ipset_pos; | |
558 | unsigned int namelen = strlen(daemon->namebuff); | |
559 | unsigned int matchlen = 0; | |
560 | for (ipset_pos = daemon->ipsets; ipset_pos; ipset_pos = ipset_pos->next) | |
6c0cb858 | 561 | { |
82a14af5 SK |
562 | unsigned int domainlen = strlen(ipset_pos->domain); |
563 | char *matchstart = daemon->namebuff + namelen - domainlen; | |
564 | if (namelen >= domainlen && hostname_isequal(matchstart, ipset_pos->domain) && | |
565 | (domainlen == 0 || namelen == domainlen || *(matchstart - 1) == '.' ) && | |
566 | domainlen >= matchlen) | |
567 | { | |
568 | matchlen = domainlen; | |
569 | sets = ipset_pos->sets; | |
570 | } | |
6c0cb858 | 571 | } |
13d86c73 JD |
572 | } |
573 | #endif | |
574 | ||
feba5c1d | 575 | /* If upstream is advertising a larger UDP packet size |
9009d746 SK |
576 | than we allow, trim it so that we don't get overlarge |
577 | requests for the client. We can't do this for signed packets. */ | |
feba5c1d | 578 | |
ed4c0767 | 579 | if ((pheader = find_pseudoheader(header, n, &plen, &sizep, &is_sign))) |
feba5c1d | 580 | { |
83349b8a SK |
581 | unsigned short udpsz; |
582 | unsigned char *psave = sizep; | |
583 | ||
584 | GETSHORT(udpsz, sizep); | |
585 | ||
586 | if (!is_sign && udpsz > daemon->edns_pktsz) | |
587 | PUTSHORT(daemon->edns_pktsz, psave); | |
feba5c1d | 588 | |
ed4c0767 SK |
589 | if (check_subnet && !check_source(header, plen, pheader, query_source)) |
590 | { | |
591 | my_syslog(LOG_WARNING, _("discarding DNS reply: subnet option mismatch")); | |
592 | return 0; | |
593 | } | |
613ad15d SK |
594 | |
595 | if (added_pheader) | |
596 | { | |
597 | pheader = 0; | |
598 | header->arcount = htons(0); | |
599 | } | |
feba5c1d | 600 | } |
83349b8a | 601 | |
28866e95 | 602 | /* RFC 4035 sect 4.6 para 3 */ |
237724c0 | 603 | if (!is_sign && !option_bool(OPT_DNSSEC_PROXY)) |
795501bc | 604 | header->hb4 &= ~HB4_AD; |
3a237152 | 605 | |
572b41eb | 606 | if (OPCODE(header) != QUERY || (RCODE(header) != NOERROR && RCODE(header) != NXDOMAIN)) |
8938ae05 | 607 | return resize_packet(header, n, pheader, plen); |
0a852541 | 608 | |
feba5c1d | 609 | /* Complain loudly if the upstream server is non-recursive. */ |
572b41eb | 610 | if (!(header->hb4 & HB4_RA) && RCODE(header) == NOERROR && ntohs(header->ancount) == 0 && |
0a852541 | 611 | server && !(server->flags & SERV_WARNED_RECURSIVE)) |
feba5c1d | 612 | { |
3d8df260 | 613 | prettyprint_addr(&server->addr, daemon->namebuff); |
f2621c7f | 614 | my_syslog(LOG_WARNING, _("nameserver %s refused to do a recursive query"), daemon->namebuff); |
28866e95 | 615 | if (!option_bool(OPT_LOG)) |
0a852541 SK |
616 | server->flags |= SERV_WARNED_RECURSIVE; |
617 | } | |
e292e93d | 618 | |
572b41eb | 619 | if (daemon->bogus_addr && RCODE(header) != NXDOMAIN && |
fd9fa481 | 620 | check_for_bogus_wildcard(header, n, daemon->namebuff, daemon->bogus_addr, now)) |
feba5c1d | 621 | { |
fd9fa481 | 622 | munged = 1; |
572b41eb SK |
623 | SET_RCODE(header, NXDOMAIN); |
624 | header->hb3 &= ~HB3_AA; | |
6938f347 | 625 | cache_secure = 0; |
36717eee | 626 | } |
fd9fa481 | 627 | else |
36717eee | 628 | { |
6938f347 SK |
629 | int doctored = 0; |
630 | ||
572b41eb | 631 | if (RCODE(header) == NXDOMAIN && |
fd9fa481 | 632 | extract_request(header, n, daemon->namebuff, NULL) && |
5aabfc78 | 633 | check_for_local_domain(daemon->namebuff, now)) |
36717eee SK |
634 | { |
635 | /* if we forwarded a query for a locally known name (because it was for | |
636 | an unknown type) and the answer is NXDOMAIN, convert that to NODATA, | |
637 | since we know that the domain exists, even if upstream doesn't */ | |
fd9fa481 | 638 | munged = 1; |
572b41eb SK |
639 | header->hb3 |= HB3_AA; |
640 | SET_RCODE(header, NOERROR); | |
6938f347 | 641 | cache_secure = 0; |
feba5c1d | 642 | } |
832af0ba | 643 | |
6938f347 | 644 | if (extract_addresses(header, n, daemon->namebuff, now, sets, is_sign, check_rebind, no_cache, cache_secure, &doctored)) |
824af85b | 645 | { |
8ef5ada2 | 646 | my_syslog(LOG_WARNING, _("possible DNS-rebind attack detected: %s"), daemon->namebuff); |
824af85b | 647 | munged = 1; |
6938f347 | 648 | cache_secure = 0; |
824af85b | 649 | } |
6938f347 SK |
650 | |
651 | if (doctored) | |
652 | cache_secure = 0; | |
feba5c1d | 653 | } |
fd9fa481 | 654 | |
a25720a3 | 655 | #ifdef HAVE_DNSSEC |
fe3992f9 | 656 | if (bogusanswer && !(header->hb4 & HB4_CD)) |
a25720a3 | 657 | { |
7d23a66f | 658 | if (!option_bool(OPT_DNSSEC_DEBUG)) |
a25720a3 SK |
659 | { |
660 | /* Bogus reply, turn into SERVFAIL */ | |
661 | SET_RCODE(header, SERVFAIL); | |
662 | munged = 1; | |
663 | } | |
664 | } | |
6938f347 SK |
665 | |
666 | if (option_bool(OPT_DNSSEC_VALID)) | |
667 | header->hb4 &= ~HB4_AD; | |
668 | ||
83349b8a | 669 | if (!(header->hb4 & HB4_CD) && ad_reqd && cache_secure) |
6938f347 | 670 | header->hb4 |= HB4_AD; |
613ad15d SK |
671 | |
672 | /* If the requestor didn't set the DO bit, don't return DNSSEC info. */ | |
673 | if (!do_bit) | |
674 | n = filter_rrsigs(header, n); | |
a25720a3 SK |
675 | #endif |
676 | ||
fd9fa481 SK |
677 | /* do this after extract_addresses. Ensure NODATA reply and remove |
678 | nameserver info. */ | |
679 | ||
680 | if (munged) | |
681 | { | |
682 | header->ancount = htons(0); | |
683 | header->nscount = htons(0); | |
684 | header->arcount = htons(0); | |
150162bc | 685 | header->hb3 &= ~HB3_TC; |
fd9fa481 SK |
686 | } |
687 | ||
36717eee SK |
688 | /* the bogus-nxdomain stuff, doctor and NXDOMAIN->NODATA munging can all elide |
689 | sections of the packet. Find the new length here and put back pseudoheader | |
690 | if it was removed. */ | |
691 | return resize_packet(header, n, pheader, plen); | |
feba5c1d SK |
692 | } |
693 | ||
3be34541 | 694 | /* sets new last_server */ |
1a6bca81 | 695 | void reply_query(int fd, int family, time_t now) |
9e4abcb5 SK |
696 | { |
697 | /* packet from peer server, extract data for cache, and send to | |
698 | original requester */ | |
572b41eb | 699 | struct dns_header *header; |
de37951c | 700 | union mysockaddr serveraddr; |
832af0ba | 701 | struct frec *forward; |
de37951c | 702 | socklen_t addrlen = sizeof(serveraddr); |
60b68069 | 703 | ssize_t n = recvfrom(fd, daemon->packet, daemon->packet_buff_sz, 0, &serveraddr.sa, &addrlen); |
cdeda28f | 704 | size_t nn; |
1a6bca81 | 705 | struct server *server; |
8a9be9e4 SK |
706 | void *hash; |
707 | #ifndef HAVE_DNSSEC | |
708 | unsigned int crc; | |
709 | #endif | |
710 | ||
cdeda28f SK |
711 | /* packet buffer overwritten */ |
712 | daemon->srv_save = NULL; | |
832af0ba | 713 | |
de37951c | 714 | /* Determine the address of the server replying so that we can mark that as good */ |
1a6bca81 | 715 | serveraddr.sa.sa_family = family; |
de37951c SK |
716 | #ifdef HAVE_IPV6 |
717 | if (serveraddr.sa.sa_family == AF_INET6) | |
5e9e0efb | 718 | serveraddr.in6.sin6_flowinfo = 0; |
de37951c | 719 | #endif |
9e4abcb5 | 720 | |
490f9075 SK |
721 | header = (struct dns_header *)daemon->packet; |
722 | ||
723 | if (n < (int)sizeof(struct dns_header) || !(header->hb3 & HB3_QR)) | |
724 | return; | |
725 | ||
1a6bca81 SK |
726 | /* spoof check: answer must come from known server, */ |
727 | for (server = daemon->servers; server; server = server->next) | |
728 | if (!(server->flags & (SERV_LITERAL_ADDRESS | SERV_NO_ADDR)) && | |
729 | sockaddr_isequal(&server->addr, &serveraddr)) | |
730 | break; | |
490f9075 SK |
731 | |
732 | if (!server) | |
733 | return; | |
734 | ||
8a9be9e4 SK |
735 | #ifdef HAVE_DNSSEC |
736 | hash = hash_questions(header, n, daemon->namebuff); | |
737 | #else | |
738 | hash = &crc; | |
739 | crc = questions_crc(header, n, daemon->namebuff); | |
740 | #endif | |
fd9fa481 | 741 | |
490f9075 | 742 | if (!(forward = lookup_frec(ntohs(header->id), hash))) |
1a6bca81 | 743 | return; |
490f9075 | 744 | |
25cf5e37 SK |
745 | /* log_query gets called indirectly all over the place, so |
746 | pass these in global variables - sorry. */ | |
747 | daemon->log_display_id = forward->log_id; | |
748 | daemon->log_source_addr = &forward->source; | |
749 | ||
32fc6dbe GH |
750 | if (daemon->ignore_addr && RCODE(header) == NOERROR && |
751 | check_for_ignored_address(header, n, daemon->ignore_addr)) | |
752 | return; | |
753 | ||
2ae195f5 | 754 | if (RCODE(header) == REFUSED && |
28866e95 | 755 | !option_bool(OPT_ORDER) && |
1a6bca81 SK |
756 | forward->forwardall == 0) |
757 | /* for broken servers, attempt to send to another one. */ | |
9e4abcb5 | 758 | { |
1a6bca81 SK |
759 | unsigned char *pheader; |
760 | size_t plen; | |
761 | int is_sign; | |
832af0ba | 762 | |
1a6bca81 SK |
763 | /* recreate query from reply */ |
764 | pheader = find_pseudoheader(header, (size_t)n, &plen, NULL, &is_sign); | |
765 | if (!is_sign) | |
832af0ba | 766 | { |
1a6bca81 SK |
767 | header->ancount = htons(0); |
768 | header->nscount = htons(0); | |
769 | header->arcount = htons(0); | |
770 | if ((nn = resize_packet(header, (size_t)n, pheader, plen))) | |
832af0ba | 771 | { |
bd7bfa21 | 772 | header->hb3 &= ~(HB3_QR | HB3_AA | HB3_TC); |
773 | header->hb4 &= ~(HB4_RA | HB4_RCODE); | |
613ad15d | 774 | forward_query(-1, NULL, NULL, 0, header, nn, now, forward, 0, 0); |
1a6bca81 | 775 | return; |
832af0ba | 776 | } |
832af0ba | 777 | } |
1a6bca81 | 778 | } |
3a237152 SK |
779 | |
780 | server = forward->sentto; | |
1a6bca81 SK |
781 | if ((forward->sentto->flags & SERV_TYPE) == 0) |
782 | { | |
51967f98 | 783 | if (RCODE(header) == REFUSED) |
1a6bca81 SK |
784 | server = NULL; |
785 | else | |
b8187c80 | 786 | { |
1a6bca81 SK |
787 | struct server *last_server; |
788 | ||
789 | /* find good server by address if possible, otherwise assume the last one we sent to */ | |
790 | for (last_server = daemon->servers; last_server; last_server = last_server->next) | |
791 | if (!(last_server->flags & (SERV_LITERAL_ADDRESS | SERV_HAS_DOMAIN | SERV_FOR_NODOTS | SERV_NO_ADDR)) && | |
792 | sockaddr_isequal(&last_server->addr, &serveraddr)) | |
793 | { | |
794 | server = last_server; | |
795 | break; | |
796 | } | |
797 | } | |
28866e95 | 798 | if (!option_bool(OPT_ALL_SERVERS)) |
1a6bca81 SK |
799 | daemon->last_server = server; |
800 | } | |
a77cec8d SK |
801 | |
802 | /* We tried resending to this server with a smaller maximum size and got an answer. | |
86fa1046 SK |
803 | Make that permanent. To avoid reduxing the packet size for an single dropped packet, |
804 | only do this when we get a truncated answer, or one larger than the safe size. */ | |
805 | if (server && (forward->flags & FREC_TEST_PKTSZ) && | |
806 | ((header->hb3 & HB3_TC) || n >= SAFE_PKTSZ)) | |
a77cec8d SK |
807 | server->edns_pktsz = SAFE_PKTSZ; |
808 | ||
1a6bca81 SK |
809 | /* If the answer is an error, keep the forward record in place in case |
810 | we get a good reply from another server. Kill it when we've | |
811 | had replies from all to avoid filling the forwarding table when | |
812 | everything is broken */ | |
51967f98 | 813 | if (forward->forwardall == 0 || --forward->forwardall == 1 || RCODE(header) != SERVFAIL) |
1a6bca81 | 814 | { |
fe3992f9 | 815 | int check_rebind = 0, no_cache_dnssec = 0, cache_secure = 0, bogusanswer = 0; |
3a237152 SK |
816 | |
817 | if (option_bool(OPT_NO_REBIND)) | |
818 | check_rebind = !(forward->flags & FREC_NOREBIND); | |
819 | ||
820 | /* Don't cache replies where DNSSEC validation was turned off, either | |
821 | the upstream server told us so, or the original query specified it. */ | |
822 | if ((header->hb4 & HB4_CD) || (forward->flags & FREC_CHECKING_DISABLED)) | |
823 | no_cache_dnssec = 1; | |
824 | ||
825 | #ifdef HAVE_DNSSEC | |
51967f98 | 826 | if (server && option_bool(OPT_DNSSEC_VALID) && !(forward->flags & FREC_CHECKING_DISABLED)) |
3a237152 | 827 | { |
9d633048 | 828 | int status; |
0fc2f313 SK |
829 | |
830 | /* We've had a reply already, which we're validating. Ignore this duplicate */ | |
e0c0ad3b | 831 | if (forward->blocking_query) |
0fc2f313 | 832 | return; |
9d633048 | 833 | |
871417d4 SK |
834 | if (header->hb3 & HB3_TC) |
835 | { | |
836 | /* Truncated answer can't be validated. | |
5d3b87a4 SK |
837 | If this is an answer to a DNSSEC-generated query, we still |
838 | need to get the client to retry over TCP, so return | |
839 | an answer with the TC bit set, even if the actual answer fits. | |
840 | */ | |
841 | status = STAT_TRUNCATED; | |
871417d4 SK |
842 | } |
843 | else if (forward->flags & FREC_DNSKEY_QUERY) | |
8d718cbb | 844 | status = dnssec_validate_by_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); |
c3e0b9b6 | 845 | else if (forward->flags & FREC_DS_QUERY) |
00a5b5d4 SK |
846 | { |
847 | status = dnssec_validate_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); | |
fe3992f9 SK |
848 | /* Provably no DS, everything below is insecure, even if signatures are offered */ |
849 | if (status == STAT_NO_DS) | |
850 | /* We only cache sigs when we've validated a reply. | |
851 | Avoid caching a reply with sigs if there's a vaildated break in the | |
852 | DS chain, so we don't return replies from cache missing sigs. */ | |
853 | status = STAT_INSECURE_DS; | |
854 | else if (status == STAT_NO_NS) | |
97e618a0 | 855 | status = STAT_BOGUS; |
00a5b5d4 SK |
856 | } |
857 | else if (forward->flags & FREC_CHECK_NOSIGN) | |
97e618a0 SK |
858 | { |
859 | status = dnssec_validate_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); | |
860 | if (status != STAT_NEED_KEY) | |
861 | status = do_check_sign(forward, status, now, daemon->namebuff, daemon->keyname); | |
862 | } | |
9d633048 | 863 | else |
00a5b5d4 | 864 | { |
97e618a0 | 865 | status = dnssec_validate_reply(now, header, n, daemon->namebuff, daemon->keyname, &forward->class, NULL, NULL); |
00a5b5d4 SK |
866 | if (status == STAT_NO_SIG) |
867 | { | |
868 | if (option_bool(OPT_DNSSEC_NO_SIGN)) | |
97e618a0 | 869 | status = send_check_sign(forward, now, header, n, daemon->namebuff, daemon->keyname); |
00a5b5d4 SK |
870 | else |
871 | status = STAT_INSECURE; | |
872 | } | |
873 | } | |
3a237152 SK |
874 | /* Can't validate, as we're missing key data. Put this |
875 | answer aside, whilst we get that. */ | |
00a5b5d4 | 876 | if (status == STAT_NEED_DS || status == STAT_NEED_DS_NEG || status == STAT_NEED_KEY) |
3a237152 | 877 | { |
7fa836e1 SK |
878 | struct frec *new, *orig; |
879 | ||
880 | /* Free any saved query */ | |
881 | if (forward->stash) | |
882 | blockdata_free(forward->stash); | |
883 | ||
884 | /* Now save reply pending receipt of key data */ | |
885 | if (!(forward->stash = blockdata_alloc((char *)header, n))) | |
886 | return; | |
887 | forward->stash_len = n; | |
0fc2f313 | 888 | |
7fa836e1 SK |
889 | anotherkey: |
890 | /* Find the original query that started it all.... */ | |
891 | for (orig = forward; orig->dependent; orig = orig->dependent); | |
892 | ||
893 | if (--orig->work_counter == 0 || !(new = get_new_frec(now, NULL, 1))) | |
894 | status = STAT_INSECURE; | |
895 | else | |
3a237152 | 896 | { |
7fa836e1 | 897 | int fd; |
0fc2f313 SK |
898 | struct frec *next = new->next; |
899 | *new = *forward; /* copy everything, then overwrite */ | |
900 | new->next = next; | |
0fc2f313 | 901 | new->blocking_query = NULL; |
8a8bbad0 | 902 | new->sentto = server; |
f1668d27 | 903 | new->rfd4 = NULL; |
97e618a0 | 904 | new->orig_domain = NULL; |
f1668d27 SK |
905 | #ifdef HAVE_IPV6 |
906 | new->rfd6 = NULL; | |
907 | #endif | |
00a5b5d4 | 908 | new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY | FREC_CHECK_NOSIGN); |
9d633048 | 909 | |
7fa836e1 SK |
910 | new->dependent = forward; /* to find query awaiting new one. */ |
911 | forward->blocking_query = new; /* for garbage cleaning */ | |
912 | /* validate routines leave name of required record in daemon->keyname */ | |
913 | if (status == STAT_NEED_KEY) | |
914 | { | |
915 | new->flags |= FREC_DNSKEY_QUERY; | |
916 | nn = dnssec_generate_query(header, ((char *) header) + daemon->packet_buff_sz, | |
a77cec8d | 917 | daemon->keyname, forward->class, T_DNSKEY, &server->addr, server->edns_pktsz); |
7fa836e1 SK |
918 | } |
919 | else | |
920 | { | |
00a5b5d4 SK |
921 | if (status == STAT_NEED_DS_NEG) |
922 | new->flags |= FREC_CHECK_NOSIGN; | |
923 | else | |
924 | new->flags |= FREC_DS_QUERY; | |
7fa836e1 | 925 | nn = dnssec_generate_query(header,((char *) header) + daemon->packet_buff_sz, |
a77cec8d | 926 | daemon->keyname, forward->class, T_DS, &server->addr, server->edns_pktsz); |
7fa836e1 SK |
927 | } |
928 | if ((hash = hash_questions(header, nn, daemon->namebuff))) | |
929 | memcpy(new->hash, hash, HASH_SIZE); | |
930 | new->new_id = get_id(); | |
931 | header->id = htons(new->new_id); | |
932 | /* Save query for retransmission */ | |
97e618a0 SK |
933 | if (!(new->stash = blockdata_alloc((char *)header, nn))) |
934 | return; | |
935 | ||
7fa836e1 SK |
936 | new->stash_len = nn; |
937 | ||
938 | /* Don't resend this. */ | |
939 | daemon->srv_save = NULL; | |
e0c0ad3b | 940 | |
7fa836e1 SK |
941 | if (server->sfd) |
942 | fd = server->sfd->fd; | |
e0c0ad3b | 943 | else |
3a237152 | 944 | { |
7fa836e1 SK |
945 | fd = -1; |
946 | #ifdef HAVE_IPV6 | |
947 | if (server->addr.sa.sa_family == AF_INET6) | |
9d633048 | 948 | { |
7fa836e1 SK |
949 | if (new->rfd6 || (new->rfd6 = allocate_rfd(AF_INET6))) |
950 | fd = new->rfd6->fd; | |
9d633048 | 951 | } |
3a237152 | 952 | else |
3a237152 | 953 | #endif |
f1668d27 | 954 | { |
7fa836e1 SK |
955 | if (new->rfd4 || (new->rfd4 = allocate_rfd(AF_INET))) |
956 | fd = new->rfd4->fd; | |
f1668d27 | 957 | } |
3a237152 | 958 | } |
7fa836e1 SK |
959 | |
960 | if (fd != -1) | |
961 | { | |
ff841ebf SK |
962 | while (retry_send(sendto(fd, (char *)header, nn, 0, |
963 | &server->addr.sa, | |
964 | sa_len(&server->addr)))); | |
7fa836e1 SK |
965 | server->queries++; |
966 | } | |
967 | ||
968 | return; | |
3a237152 | 969 | } |
3a237152 SK |
970 | } |
971 | ||
972 | /* Ok, we reached far enough up the chain-of-trust that we can validate something. | |
973 | Now wind back down, pulling back answers which wouldn't previously validate | |
7fa836e1 SK |
974 | and validate them with the new data. Note that if an answer needs multiple |
975 | keys to validate, we may find another key is needed, in which case we set off | |
976 | down another branch of the tree. Once we get to the original answer | |
977 | (FREC_DNSSEC_QUERY not set) and it validates, return it to the original requestor. */ | |
0744ca66 | 978 | while (forward->dependent) |
3a237152 | 979 | { |
0744ca66 SK |
980 | struct frec *prev = forward->dependent; |
981 | free_frec(forward); | |
982 | forward = prev; | |
983 | forward->blocking_query = NULL; /* already gone */ | |
984 | blockdata_retrieve(forward->stash, forward->stash_len, (void *)header); | |
985 | n = forward->stash_len; | |
986 | ||
987 | if (status == STAT_SECURE) | |
3a237152 | 988 | { |
0744ca66 SK |
989 | if (forward->flags & FREC_DNSKEY_QUERY) |
990 | status = dnssec_validate_by_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); | |
991 | else if (forward->flags & FREC_DS_QUERY) | |
00a5b5d4 SK |
992 | { |
993 | status = dnssec_validate_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); | |
fe3992f9 SK |
994 | /* Provably no DS, everything below is insecure, even if signatures are offered */ |
995 | if (status == STAT_NO_DS) | |
996 | /* We only cache sigs when we've validated a reply. | |
997 | Avoid caching a reply with sigs if there's a vaildated break in the | |
998 | DS chain, so we don't return replies from cache missing sigs. */ | |
999 | status = STAT_INSECURE_DS; | |
1000 | else if (status == STAT_NO_NS) | |
1001 | status = STAT_BOGUS; | |
00a5b5d4 SK |
1002 | } |
1003 | else if (forward->flags & FREC_CHECK_NOSIGN) | |
97e618a0 SK |
1004 | { |
1005 | status = dnssec_validate_ds(now, header, n, daemon->namebuff, daemon->keyname, forward->class); | |
1006 | if (status != STAT_NEED_KEY) | |
1007 | status = do_check_sign(forward, status, now, daemon->namebuff, daemon->keyname); | |
1008 | } | |
0744ca66 | 1009 | else |
00a5b5d4 | 1010 | { |
97e618a0 | 1011 | status = dnssec_validate_reply(now, header, n, daemon->namebuff, daemon->keyname, &forward->class, NULL, NULL); |
00a5b5d4 SK |
1012 | if (status == STAT_NO_SIG) |
1013 | { | |
1014 | if (option_bool(OPT_DNSSEC_NO_SIGN)) | |
97e618a0 | 1015 | status = send_check_sign(forward, now, header, n, daemon->namebuff, daemon->keyname); |
00a5b5d4 SK |
1016 | else |
1017 | status = STAT_INSECURE; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | if (status == STAT_NEED_DS || status == STAT_NEED_DS_NEG || status == STAT_NEED_KEY) | |
7fa836e1 | 1022 | goto anotherkey; |
3a237152 SK |
1023 | } |
1024 | } | |
5d3b87a4 | 1025 | |
fe3992f9 SK |
1026 | no_cache_dnssec = 0; |
1027 | ||
1028 | if (status == STAT_INSECURE_DS) | |
1029 | { | |
1030 | /* We only cache sigs when we've validated a reply. | |
1031 | Avoid caching a reply with sigs if there's a vaildated break in the | |
1032 | DS chain, so we don't return replies from cache missing sigs. */ | |
1033 | status = STAT_INSECURE; | |
1034 | no_cache_dnssec = 1; | |
1035 | } | |
1036 | ||
5d3b87a4 | 1037 | if (status == STAT_TRUNCATED) |
0744ca66 | 1038 | header->hb3 |= HB3_TC; |
5d3b87a4 | 1039 | else |
7fa836e1 | 1040 | { |
554b580e | 1041 | char *result, *domain = "result"; |
7fa836e1 SK |
1042 | |
1043 | if (forward->work_counter == 0) | |
150162bc SK |
1044 | { |
1045 | result = "ABANDONED"; | |
1046 | status = STAT_BOGUS; | |
1047 | } | |
7fa836e1 SK |
1048 | else |
1049 | result = (status == STAT_SECURE ? "SECURE" : (status == STAT_INSECURE ? "INSECURE" : "BOGUS")); | |
1050 | ||
554b580e SK |
1051 | if (status == STAT_BOGUS && extract_request(header, n, daemon->namebuff, NULL)) |
1052 | domain = daemon->namebuff; | |
1053 | ||
1054 | log_query(F_KEYTAG | F_SECSTAT, domain, NULL, result); | |
7fa836e1 | 1055 | } |
5d3b87a4 | 1056 | |
3a237152 SK |
1057 | if (status == STAT_SECURE) |
1058 | cache_secure = 1; | |
3a237152 | 1059 | else if (status == STAT_BOGUS) |
fe3992f9 SK |
1060 | { |
1061 | no_cache_dnssec = 1; | |
1062 | bogusanswer = 1; | |
1063 | } | |
3a237152 | 1064 | } |
83349b8a SK |
1065 | #endif |
1066 | ||
1067 | /* restore CD bit to the value in the query */ | |
1068 | if (forward->flags & FREC_CHECKING_DISABLED) | |
1069 | header->hb4 |= HB4_CD; | |
1070 | else | |
1071 | header->hb4 &= ~HB4_CD; | |
8ef5ada2 | 1072 | |
fe3992f9 | 1073 | if ((nn = process_reply(header, now, server, (size_t)n, check_rebind, no_cache_dnssec, cache_secure, bogusanswer, |
613ad15d SK |
1074 | forward->flags & FREC_AD_QUESTION, forward->flags & FREC_DO_QUESTION, |
1075 | forward->flags & FREC_ADDED_PHEADER, forward->flags & FREC_HAS_SUBNET, &forward->source))) | |
1a6bca81 SK |
1076 | { |
1077 | header->id = htons(forward->orig_id); | |
572b41eb | 1078 | header->hb4 |= HB4_RA; /* recursion if available */ |
54dd393f | 1079 | send_from(forward->fd, option_bool(OPT_NOWILD) || option_bool (OPT_CLEVERBIND), daemon->packet, nn, |
50303b19 | 1080 | &forward->source, &forward->dest, forward->iface); |
b8187c80 | 1081 | } |
1a6bca81 | 1082 | free_frec(forward); /* cancel */ |
9e4abcb5 | 1083 | } |
9e4abcb5 | 1084 | } |
44a2a316 | 1085 | |
1a6bca81 | 1086 | |
5aabfc78 | 1087 | void receive_query(struct listener *listen, time_t now) |
44a2a316 | 1088 | { |
572b41eb | 1089 | struct dns_header *header = (struct dns_header *)daemon->packet; |
44a2a316 | 1090 | union mysockaddr source_addr; |
c1bb8504 | 1091 | unsigned short type; |
44a2a316 | 1092 | struct all_addr dst_addr; |
f6b7dc47 | 1093 | struct in_addr netmask, dst_addr_4; |
cdeda28f SK |
1094 | size_t m; |
1095 | ssize_t n; | |
3b195961 VG |
1096 | int if_index = 0, auth_dns = 0; |
1097 | #ifdef HAVE_AUTH | |
1098 | int local_auth = 0; | |
1099 | #endif | |
44a2a316 SK |
1100 | struct iovec iov[1]; |
1101 | struct msghdr msg; | |
1102 | struct cmsghdr *cmptr; | |
44a2a316 SK |
1103 | union { |
1104 | struct cmsghdr align; /* this ensures alignment */ | |
1105 | #ifdef HAVE_IPV6 | |
1106 | char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; | |
1107 | #endif | |
5e9e0efb | 1108 | #if defined(HAVE_LINUX_NETWORK) |
44a2a316 | 1109 | char control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
824af85b SK |
1110 | #elif defined(IP_RECVDSTADDR) && defined(HAVE_SOLARIS_NETWORK) |
1111 | char control[CMSG_SPACE(sizeof(struct in_addr)) + | |
1112 | CMSG_SPACE(sizeof(unsigned int))]; | |
44a2a316 SK |
1113 | #elif defined(IP_RECVDSTADDR) |
1114 | char control[CMSG_SPACE(sizeof(struct in_addr)) + | |
1115 | CMSG_SPACE(sizeof(struct sockaddr_dl))]; | |
1116 | #endif | |
1117 | } control_u; | |
2329bef5 SK |
1118 | #ifdef HAVE_IPV6 |
1119 | /* Can always get recvd interface for IPv6 */ | |
1120 | int check_dst = !option_bool(OPT_NOWILD) || listen->family == AF_INET6; | |
1121 | #else | |
1122 | int check_dst = !option_bool(OPT_NOWILD); | |
1123 | #endif | |
1124 | ||
cdeda28f SK |
1125 | /* packet buffer overwritten */ |
1126 | daemon->srv_save = NULL; | |
1127 | ||
98906275 | 1128 | dst_addr_4.s_addr = dst_addr.addr.addr4.s_addr = 0; |
4f7b304f SK |
1129 | netmask.s_addr = 0; |
1130 | ||
7e5664bd | 1131 | if (option_bool(OPT_NOWILD) && listen->iface) |
3d8df260 | 1132 | { |
4f7b304f SK |
1133 | auth_dns = listen->iface->dns_auth; |
1134 | ||
1135 | if (listen->family == AF_INET) | |
1136 | { | |
98906275 | 1137 | dst_addr_4 = dst_addr.addr.addr4 = listen->iface->addr.in.sin_addr; |
4f7b304f SK |
1138 | netmask = listen->iface->netmask; |
1139 | } | |
3d8df260 | 1140 | } |
4f7b304f | 1141 | |
3be34541 SK |
1142 | iov[0].iov_base = daemon->packet; |
1143 | iov[0].iov_len = daemon->edns_pktsz; | |
44a2a316 SK |
1144 | |
1145 | msg.msg_control = control_u.control; | |
1146 | msg.msg_controllen = sizeof(control_u); | |
1147 | msg.msg_flags = 0; | |
1148 | msg.msg_name = &source_addr; | |
1149 | msg.msg_namelen = sizeof(source_addr); | |
1150 | msg.msg_iov = iov; | |
1151 | msg.msg_iovlen = 1; | |
1152 | ||
de37951c | 1153 | if ((n = recvmsg(listen->fd, &msg, 0)) == -1) |
3be34541 | 1154 | return; |
44a2a316 | 1155 | |
572b41eb | 1156 | if (n < (int)sizeof(struct dns_header) || |
5e9e0efb | 1157 | (msg.msg_flags & MSG_TRUNC) || |
572b41eb | 1158 | (header->hb3 & HB3_QR)) |
26128d27 SK |
1159 | return; |
1160 | ||
44a2a316 | 1161 | source_addr.sa.sa_family = listen->family; |
2a7a2b84 SK |
1162 | |
1163 | if (listen->family == AF_INET) | |
1164 | { | |
1165 | /* Source-port == 0 is an error, we can't send back to that. | |
1166 | http://www.ietf.org/mail-archive/web/dnsop/current/msg11441.html */ | |
1167 | if (source_addr.in.sin_port == 0) | |
1168 | return; | |
1169 | } | |
44a2a316 | 1170 | #ifdef HAVE_IPV6 |
2a7a2b84 SK |
1171 | else |
1172 | { | |
1173 | /* Source-port == 0 is an error, we can't send back to that. */ | |
1174 | if (source_addr.in6.sin6_port == 0) | |
1175 | return; | |
1176 | source_addr.in6.sin6_flowinfo = 0; | |
1177 | } | |
44a2a316 | 1178 | #endif |
2a7a2b84 | 1179 | |
c8a80487 SK |
1180 | /* We can be configured to only accept queries from at-most-one-hop-away addresses. */ |
1181 | if (option_bool(OPT_LOCAL_SERVICE)) | |
1182 | { | |
1183 | struct addrlist *addr; | |
1184 | #ifdef HAVE_IPV6 | |
1185 | if (listen->family == AF_INET6) | |
1186 | { | |
1187 | for (addr = daemon->interface_addrs; addr; addr = addr->next) | |
1188 | if ((addr->flags & ADDRLIST_IPV6) && | |
1189 | is_same_net6(&addr->addr.addr.addr6, &source_addr.in6.sin6_addr, addr->prefixlen)) | |
1190 | break; | |
1191 | } | |
1192 | else | |
1193 | #endif | |
1194 | { | |
1195 | struct in_addr netmask; | |
1196 | for (addr = daemon->interface_addrs; addr; addr = addr->next) | |
1197 | { | |
15b1b7e9 | 1198 | netmask.s_addr = htonl(~(in_addr_t)0 << (32 - addr->prefixlen)); |
c8a80487 SK |
1199 | if (!(addr->flags & ADDRLIST_IPV6) && |
1200 | is_same_net(addr->addr.addr.addr4, source_addr.in.sin_addr, netmask)) | |
1201 | break; | |
1202 | } | |
1203 | } | |
1204 | if (!addr) | |
1205 | { | |
0c8584ea SK |
1206 | static int warned = 0; |
1207 | if (!warned) | |
1208 | { | |
1209 | my_syslog(LOG_WARNING, _("Ignoring query from non-local network")); | |
1210 | warned = 1; | |
1211 | } | |
c8a80487 SK |
1212 | return; |
1213 | } | |
1214 | } | |
1215 | ||
2329bef5 | 1216 | if (check_dst) |
26128d27 SK |
1217 | { |
1218 | struct ifreq ifr; | |
1219 | ||
1220 | if (msg.msg_controllen < sizeof(struct cmsghdr)) | |
1221 | return; | |
44a2a316 | 1222 | |
5e9e0efb | 1223 | #if defined(HAVE_LINUX_NETWORK) |
26128d27 SK |
1224 | if (listen->family == AF_INET) |
1225 | for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr)) | |
c72daea8 | 1226 | if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_PKTINFO) |
26128d27 | 1227 | { |
8ef5ada2 SK |
1228 | union { |
1229 | unsigned char *c; | |
1230 | struct in_pktinfo *p; | |
1231 | } p; | |
1232 | p.c = CMSG_DATA(cmptr); | |
1233 | dst_addr_4 = dst_addr.addr.addr4 = p.p->ipi_spec_dst; | |
1234 | if_index = p.p->ipi_ifindex; | |
26128d27 SK |
1235 | } |
1236 | #elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF) | |
1237 | if (listen->family == AF_INET) | |
44a2a316 | 1238 | { |
26128d27 | 1239 | for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr)) |
8ef5ada2 SK |
1240 | { |
1241 | union { | |
1242 | unsigned char *c; | |
1243 | unsigned int *i; | |
1244 | struct in_addr *a; | |
1245 | #ifndef HAVE_SOLARIS_NETWORK | |
1246 | struct sockaddr_dl *s; | |
1247 | #endif | |
1248 | } p; | |
1249 | p.c = CMSG_DATA(cmptr); | |
1250 | if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_RECVDSTADDR) | |
1251 | dst_addr_4 = dst_addr.addr.addr4 = *(p.a); | |
1252 | else if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_RECVIF) | |
824af85b | 1253 | #ifdef HAVE_SOLARIS_NETWORK |
8ef5ada2 | 1254 | if_index = *(p.i); |
824af85b | 1255 | #else |
8ef5ada2 | 1256 | if_index = p.s->sdl_index; |
824af85b | 1257 | #endif |
8ef5ada2 | 1258 | } |
44a2a316 | 1259 | } |
44a2a316 | 1260 | #endif |
26128d27 | 1261 | |
44a2a316 | 1262 | #ifdef HAVE_IPV6 |
26128d27 SK |
1263 | if (listen->family == AF_INET6) |
1264 | { | |
1265 | for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr)) | |
c72daea8 | 1266 | if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo) |
26128d27 | 1267 | { |
8ef5ada2 SK |
1268 | union { |
1269 | unsigned char *c; | |
1270 | struct in6_pktinfo *p; | |
1271 | } p; | |
1272 | p.c = CMSG_DATA(cmptr); | |
1273 | ||
1274 | dst_addr.addr.addr6 = p.p->ipi6_addr; | |
1275 | if_index = p.p->ipi6_ifindex; | |
26128d27 SK |
1276 | } |
1277 | } | |
44a2a316 | 1278 | #endif |
26128d27 SK |
1279 | |
1280 | /* enforce available interface configuration */ | |
1281 | ||
e25db1f2 | 1282 | if (!indextoname(listen->fd, if_index, ifr.ifr_name)) |
5e9e0efb | 1283 | return; |
832af0ba | 1284 | |
e25db1f2 SK |
1285 | if (!iface_check(listen->family, &dst_addr, ifr.ifr_name, &auth_dns)) |
1286 | { | |
1287 | if (!option_bool(OPT_CLEVERBIND)) | |
115ac3e4 | 1288 | enumerate_interfaces(0); |
3f2873d4 SK |
1289 | if (!loopback_exception(listen->fd, listen->family, &dst_addr, ifr.ifr_name) && |
1290 | !label_exception(if_index, listen->family, &dst_addr)) | |
e25db1f2 SK |
1291 | return; |
1292 | } | |
1293 | ||
552af8b9 SK |
1294 | if (listen->family == AF_INET && option_bool(OPT_LOCALISE)) |
1295 | { | |
1296 | struct irec *iface; | |
1297 | ||
1298 | /* get the netmask of the interface whch has the address we were sent to. | |
1299 | This is no neccessarily the interface we arrived on. */ | |
1300 | ||
1301 | for (iface = daemon->interfaces; iface; iface = iface->next) | |
1302 | if (iface->addr.sa.sa_family == AF_INET && | |
1303 | iface->addr.in.sin_addr.s_addr == dst_addr_4.s_addr) | |
1304 | break; | |
1305 | ||
1306 | /* interface may be new */ | |
e25db1f2 | 1307 | if (!iface && !option_bool(OPT_CLEVERBIND)) |
115ac3e4 | 1308 | enumerate_interfaces(0); |
552af8b9 SK |
1309 | |
1310 | for (iface = daemon->interfaces; iface; iface = iface->next) | |
1311 | if (iface->addr.sa.sa_family == AF_INET && | |
1312 | iface->addr.in.sin_addr.s_addr == dst_addr_4.s_addr) | |
1313 | break; | |
1314 | ||
1315 | /* If we failed, abandon localisation */ | |
1316 | if (iface) | |
1317 | netmask = iface->netmask; | |
1318 | else | |
1319 | dst_addr_4.s_addr = 0; | |
1320 | } | |
44a2a316 | 1321 | } |
25cf5e37 SK |
1322 | |
1323 | /* log_query gets called indirectly all over the place, so | |
1324 | pass these in global variables - sorry. */ | |
1325 | daemon->log_display_id = ++daemon->log_id; | |
1326 | daemon->log_source_addr = &source_addr; | |
44a2a316 | 1327 | |
cdeda28f | 1328 | if (extract_request(header, (size_t)n, daemon->namebuff, &type)) |
44a2a316 | 1329 | { |
b485ed97 SK |
1330 | #ifdef HAVE_AUTH |
1331 | struct auth_zone *zone; | |
1332 | #endif | |
610e782a SK |
1333 | char *types = querystr(auth_dns ? "auth" : "query", type); |
1334 | ||
44a2a316 | 1335 | if (listen->family == AF_INET) |
3be34541 | 1336 | log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, |
1a6bca81 | 1337 | (struct all_addr *)&source_addr.in.sin_addr, types); |
44a2a316 SK |
1338 | #ifdef HAVE_IPV6 |
1339 | else | |
3be34541 | 1340 | log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, |
1a6bca81 | 1341 | (struct all_addr *)&source_addr.in6.sin6_addr, types); |
44a2a316 | 1342 | #endif |
44a2a316 | 1343 | |
b485ed97 SK |
1344 | #ifdef HAVE_AUTH |
1345 | /* find queries for zones we're authoritative for, and answer them directly */ | |
6008bdbb SK |
1346 | if (!auth_dns) |
1347 | for (zone = daemon->auth_zones; zone; zone = zone->next) | |
1348 | if (in_zone(zone, daemon->namebuff, NULL)) | |
1349 | { | |
1350 | auth_dns = 1; | |
1351 | local_auth = 1; | |
1352 | break; | |
1353 | } | |
b485ed97 | 1354 | #endif |
b5ea1cc2 SK |
1355 | |
1356 | #ifdef HAVE_LOOP | |
1357 | /* Check for forwarding loop */ | |
1358 | if (detect_loop(daemon->namebuff, type)) | |
1359 | return; | |
1360 | #endif | |
b485ed97 SK |
1361 | } |
1362 | ||
4820dce9 | 1363 | #ifdef HAVE_AUTH |
4f7b304f | 1364 | if (auth_dns) |
824af85b | 1365 | { |
60b68069 | 1366 | m = answer_auth(header, ((char *) header) + daemon->packet_buff_sz, (size_t)n, now, &source_addr, local_auth); |
4f7b304f | 1367 | if (m >= 1) |
b485ed97 SK |
1368 | { |
1369 | send_from(listen->fd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), | |
1370 | (char *)header, m, &source_addr, &dst_addr, if_index); | |
1371 | daemon->auth_answer++; | |
1372 | } | |
824af85b | 1373 | } |
44a2a316 | 1374 | else |
4820dce9 | 1375 | #endif |
4f7b304f | 1376 | { |
613ad15d | 1377 | int ad_reqd, do_bit; |
60b68069 | 1378 | m = answer_request(header, ((char *) header) + daemon->packet_buff_sz, (size_t)n, |
613ad15d | 1379 | dst_addr_4, netmask, now, &ad_reqd, &do_bit); |
4f7b304f SK |
1380 | |
1381 | if (m >= 1) | |
1382 | { | |
1383 | send_from(listen->fd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), | |
1384 | (char *)header, m, &source_addr, &dst_addr, if_index); | |
1385 | daemon->local_answer++; | |
1386 | } | |
1387 | else if (forward_query(listen->fd, &source_addr, &dst_addr, if_index, | |
613ad15d | 1388 | header, (size_t)n, now, NULL, ad_reqd, do_bit)) |
4f7b304f SK |
1389 | daemon->queries_forwarded++; |
1390 | else | |
1391 | daemon->local_answer++; | |
1392 | } | |
44a2a316 SK |
1393 | } |
1394 | ||
7d7b7b31 | 1395 | #ifdef HAVE_DNSSEC |
00a5b5d4 SK |
1396 | |
1397 | /* UDP: we've got an unsigned answer, return STAT_INSECURE if we can prove there's no DS | |
1398 | and therefore the answer shouldn't be signed, or STAT_BOGUS if it should be, or | |
1399 | STAT_NEED_DS_NEG and keyname if we need to do the query. */ | |
97e618a0 SK |
1400 | static int send_check_sign(struct frec *forward, time_t now, struct dns_header *header, size_t plen, |
1401 | char *name, char *keyname) | |
00a5b5d4 | 1402 | { |
00a5b5d4 SK |
1403 | int status = dnssec_chase_cname(now, header, plen, name, keyname); |
1404 | ||
1405 | if (status != STAT_INSECURE) | |
1406 | return status; | |
1407 | ||
97e618a0 SK |
1408 | /* Store the domain we're trying to check. */ |
1409 | forward->name_start = strlen(name); | |
1410 | forward->name_len = forward->name_start + 1; | |
1411 | if (!(forward->orig_domain = blockdata_alloc(name, forward->name_len))) | |
1412 | return STAT_BOGUS; | |
1413 | ||
1414 | return do_check_sign(forward, 0, now, name, keyname); | |
1415 | } | |
1416 | ||
1417 | /* We either have a a reply (header non-NULL, or we need to start by looking in the cache */ | |
1418 | static int do_check_sign(struct frec *forward, int status, time_t now, char *name, char *keyname) | |
1419 | { | |
1420 | /* get domain we're checking back from blockdata store, it's stored on the original query. */ | |
1421 | while (forward->dependent) | |
1422 | forward = forward->dependent; | |
1423 | ||
1424 | blockdata_retrieve(forward->orig_domain, forward->name_len, name); | |
1425 | ||
00a5b5d4 SK |
1426 | while (1) |
1427 | { | |
97e618a0 SK |
1428 | char *p; |
1429 | ||
1430 | if (status == 0) | |
00a5b5d4 | 1431 | { |
97e618a0 SK |
1432 | struct crec *crecp; |
1433 | ||
1434 | /* Haven't received answer, see if in cache */ | |
1435 | if (!(crecp = cache_find_by_name(NULL, &name[forward->name_start], now, F_DS))) | |
1436 | { | |
1437 | /* put name of DS record we're missing into keyname */ | |
1438 | strcpy(keyname, &name[forward->name_start]); | |
1439 | /* and wait for reply to arrive */ | |
1440 | return STAT_NEED_DS_NEG; | |
1441 | } | |
1442 | ||
1443 | /* F_DNSSECOK misused in DS cache records to non-existance of NS record */ | |
1444 | if (!(crecp->flags & F_NEG)) | |
1445 | status = STAT_SECURE; | |
1446 | else if (crecp->flags & F_DNSSECOK) | |
1447 | status = STAT_NO_DS; | |
1448 | else | |
1449 | status = STAT_NO_NS; | |
00a5b5d4 | 1450 | } |
97e618a0 SK |
1451 | |
1452 | /* Have entered non-signed part of DNS tree. */ | |
1453 | if (status == STAT_NO_DS) | |
1454 | return STAT_INSECURE; | |
00a5b5d4 | 1455 | |
97e618a0 | 1456 | if (status == STAT_BOGUS) |
4e1fe444 SK |
1457 | return STAT_BOGUS; |
1458 | ||
97e618a0 SK |
1459 | /* There's a proven DS record, or we're within a zone, where there doesn't need |
1460 | to be a DS record. Add a name and try again. | |
1461 | If we've already tried the whole name, then fail */ | |
00a5b5d4 | 1462 | |
97e618a0 SK |
1463 | if (forward->name_start == 0) |
1464 | return STAT_BOGUS; | |
4872aa74 | 1465 | |
97e618a0 SK |
1466 | for (p = &name[forward->name_start-2]; (*p != '.') && (p != name); p--); |
1467 | ||
1468 | if (p != name) | |
1469 | p++; | |
1470 | ||
1471 | forward->name_start = p - name; | |
1472 | status = 0; /* force to cache when we iterate. */ | |
00a5b5d4 | 1473 | } |
00a5b5d4 SK |
1474 | } |
1475 | ||
fe3992f9 | 1476 | /* Move down from the root, until we find a signed non-existance of a DS, in which case |
00a5b5d4 SK |
1477 | an unsigned answer is OK, or we find a signed DS, in which case there should be |
1478 | a signature, and the answer is BOGUS */ | |
1479 | static int tcp_check_for_unsigned_zone(time_t now, struct dns_header *header, size_t plen, int class, char *name, | |
1480 | char *keyname, struct server *server, int *keycount) | |
1481 | { | |
1482 | size_t m; | |
1483 | unsigned char *packet, *payload; | |
1484 | u16 *length; | |
97e618a0 SK |
1485 | int status, name_len; |
1486 | struct blockdata *block; | |
1487 | ||
1488 | char *name_start; | |
00a5b5d4 SK |
1489 | |
1490 | /* Get first insecure entry in CNAME chain */ | |
1491 | status = tcp_key_recurse(now, STAT_CHASE_CNAME, header, plen, class, name, keyname, server, keycount); | |
1492 | if (status == STAT_BOGUS) | |
1493 | return STAT_BOGUS; | |
1494 | ||
1495 | if (!(packet = whine_malloc(65536 + MAXDNAME + RRFIXEDSZ + sizeof(u16)))) | |
1496 | return STAT_BOGUS; | |
1497 | ||
1498 | payload = &packet[2]; | |
1499 | header = (struct dns_header *)payload; | |
1500 | length = (u16 *)packet; | |
97e618a0 SK |
1501 | |
1502 | /* Stash the name away, since the buffer will be trashed when we recurse */ | |
1503 | name_len = strlen(name) + 1; | |
1504 | name_start = name + name_len - 1; | |
00a5b5d4 | 1505 | |
97e618a0 SK |
1506 | if (!(block = blockdata_alloc(name, name_len))) |
1507 | { | |
1508 | free(packet); | |
1509 | return STAT_BOGUS; | |
1510 | } | |
1511 | ||
00a5b5d4 SK |
1512 | while (1) |
1513 | { | |
00a5b5d4 | 1514 | unsigned char c1, c2; |
97e618a0 SK |
1515 | struct crec *crecp; |
1516 | ||
00a5b5d4 | 1517 | if (--(*keycount) == 0) |
fc2833f1 TH |
1518 | { |
1519 | free(packet); | |
97e618a0 | 1520 | blockdata_free(block); |
fc2833f1 TH |
1521 | return STAT_BOGUS; |
1522 | } | |
00a5b5d4 | 1523 | |
424c4a8a | 1524 | while ((crecp = cache_find_by_name(NULL, name_start, now, F_DS))) |
97e618a0 SK |
1525 | { |
1526 | if ((crecp->flags & F_NEG) && (crecp->flags & F_DNSSECOK)) | |
1527 | { | |
1528 | /* Found a secure denial of DS - delegation is indeed insecure */ | |
1529 | free(packet); | |
1530 | blockdata_free(block); | |
1531 | return STAT_INSECURE; | |
1532 | } | |
1533 | ||
1534 | /* Here, either there's a secure DS, or no NS and no DS, and therefore no delegation. | |
1535 | Add another label and continue. */ | |
1536 | ||
1537 | if (name_start == name) | |
1538 | { | |
1539 | free(packet); | |
1540 | blockdata_free(block); | |
1541 | return STAT_BOGUS; /* run out of labels */ | |
1542 | } | |
1543 | ||
1544 | name_start -= 2; | |
1545 | while (*name_start != '.' && name_start != name) | |
1546 | name_start--; | |
1547 | if (name_start != name) | |
1548 | name_start++; | |
4e1fe444 | 1549 | } |
97e618a0 SK |
1550 | |
1551 | /* Can't find it in the cache, have to send a query */ | |
4e1fe444 | 1552 | |
a77cec8d | 1553 | m = dnssec_generate_query(header, ((char *) header) + 65536, name_start, class, T_DS, &server->addr, server->edns_pktsz); |
00a5b5d4 | 1554 | |
97e618a0 | 1555 | *length = htons(m); |
b37f8b99 | 1556 | |
97e618a0 SK |
1557 | if (read_write(server->tcpfd, packet, m + sizeof(u16), 0) && |
1558 | read_write(server->tcpfd, &c1, 1, 1) && | |
1559 | read_write(server->tcpfd, &c2, 1, 1) && | |
1560 | read_write(server->tcpfd, payload, (c1 << 8) | c2, 1)) | |
1561 | { | |
1562 | m = (c1 << 8) | c2; | |
00a5b5d4 | 1563 | |
97e618a0 SK |
1564 | /* Note this trashes all three name workspaces */ |
1565 | status = tcp_key_recurse(now, STAT_NEED_DS_NEG, header, m, class, name, keyname, server, keycount); | |
1566 | ||
1567 | if (status == STAT_NO_DS) | |
00a5b5d4 | 1568 | { |
97e618a0 SK |
1569 | /* Found a secure denial of DS - delegation is indeed insecure */ |
1570 | free(packet); | |
1571 | blockdata_free(block); | |
1572 | return STAT_INSECURE; | |
1573 | } | |
1574 | ||
1575 | if (status == STAT_BOGUS) | |
1576 | { | |
1577 | free(packet); | |
1578 | blockdata_free(block); | |
1579 | return STAT_BOGUS; | |
1580 | } | |
1581 | ||
1582 | /* Here, either there's a secure DS, or no NS and no DS, and therefore no delegation. | |
1583 | Add another label and continue. */ | |
1584 | ||
1585 | /* Get name we're checking back. */ | |
1586 | blockdata_retrieve(block, name_len, name); | |
1587 | ||
1588 | if (name_start == name) | |
1589 | { | |
1590 | free(packet); | |
1591 | blockdata_free(block); | |
1592 | return STAT_BOGUS; /* run out of labels */ | |
00a5b5d4 | 1593 | } |
97e618a0 SK |
1594 | |
1595 | name_start -= 2; | |
1596 | while (*name_start != '.' && name_start != name) | |
1597 | name_start--; | |
1598 | if (name_start != name) | |
1599 | name_start++; | |
1600 | } | |
1601 | else | |
1602 | { | |
1603 | /* IO failure */ | |
1604 | free(packet); | |
1605 | blockdata_free(block); | |
1606 | return STAT_BOGUS; /* run out of labels */ | |
00a5b5d4 | 1607 | } |
00a5b5d4 SK |
1608 | } |
1609 | } | |
1610 | ||
7fa836e1 SK |
1611 | static int tcp_key_recurse(time_t now, int status, struct dns_header *header, size_t n, |
1612 | int class, char *name, char *keyname, struct server *server, int *keycount) | |
7d7b7b31 SK |
1613 | { |
1614 | /* Recurse up the key heirarchy */ | |
7d7b7b31 | 1615 | int new_status; |
7d7b7b31 | 1616 | |
7fa836e1 SK |
1617 | /* limit the amount of work we do, to avoid cycling forever on loops in the DNS */ |
1618 | if (--(*keycount) == 0) | |
1619 | return STAT_INSECURE; | |
7d7b7b31 | 1620 | |
7fa836e1 SK |
1621 | if (status == STAT_NEED_KEY) |
1622 | new_status = dnssec_validate_by_ds(now, header, n, name, keyname, class); | |
00a5b5d4 SK |
1623 | else if (status == STAT_NEED_DS || status == STAT_NEED_DS_NEG) |
1624 | { | |
1625 | new_status = dnssec_validate_ds(now, header, n, name, keyname, class); | |
fe3992f9 SK |
1626 | if (status == STAT_NEED_DS) |
1627 | { | |
1628 | if (new_status == STAT_NO_DS) | |
1629 | new_status = STAT_INSECURE_DS; | |
1630 | else if (new_status == STAT_NO_NS) | |
1631 | new_status = STAT_BOGUS; | |
1632 | } | |
00a5b5d4 SK |
1633 | } |
1634 | else if (status == STAT_CHASE_CNAME) | |
1635 | new_status = dnssec_chase_cname(now, header, n, name, keyname); | |
1636 | else | |
1637 | { | |
97e618a0 | 1638 | new_status = dnssec_validate_reply(now, header, n, name, keyname, &class, NULL, NULL); |
00a5b5d4 SK |
1639 | |
1640 | if (new_status == STAT_NO_SIG) | |
1641 | { | |
1642 | if (option_bool(OPT_DNSSEC_NO_SIGN)) | |
1643 | new_status = tcp_check_for_unsigned_zone(now, header, n, class, name, keyname, server, keycount); | |
1644 | else | |
1645 | new_status = STAT_INSECURE; | |
1646 | } | |
1647 | } | |
1648 | ||
7fa836e1 SK |
1649 | /* Can't validate because we need a key/DS whose name now in keyname. |
1650 | Make query for same, and recurse to validate */ | |
1651 | if (new_status == STAT_NEED_DS || new_status == STAT_NEED_KEY) | |
7d7b7b31 | 1652 | { |
7fa836e1 SK |
1653 | size_t m; |
1654 | unsigned char *packet = whine_malloc(65536 + MAXDNAME + RRFIXEDSZ + sizeof(u16)); | |
1655 | unsigned char *payload = &packet[2]; | |
1656 | struct dns_header *new_header = (struct dns_header *)payload; | |
1657 | u16 *length = (u16 *)packet; | |
1658 | unsigned char c1, c2; | |
1659 | ||
1660 | if (!packet) | |
1661 | return STAT_INSECURE; | |
1662 | ||
1663 | another_tcp_key: | |
1664 | m = dnssec_generate_query(new_header, ((char *) new_header) + 65536, keyname, class, | |
a77cec8d | 1665 | new_status == STAT_NEED_KEY ? T_DNSKEY : T_DS, &server->addr, server->edns_pktsz); |
7d7b7b31 | 1666 | |
7fa836e1 | 1667 | *length = htons(m); |
7d7b7b31 | 1668 | |
7fa836e1 SK |
1669 | if (!read_write(server->tcpfd, packet, m + sizeof(u16), 0) || |
1670 | !read_write(server->tcpfd, &c1, 1, 1) || | |
1671 | !read_write(server->tcpfd, &c2, 1, 1) || | |
1672 | !read_write(server->tcpfd, payload, (c1 << 8) | c2, 1)) | |
1673 | new_status = STAT_INSECURE; | |
1674 | else | |
7d7b7b31 | 1675 | { |
7fa836e1 SK |
1676 | m = (c1 << 8) | c2; |
1677 | ||
00a5b5d4 SK |
1678 | new_status = tcp_key_recurse(now, new_status, new_header, m, class, name, keyname, server, keycount); |
1679 | ||
1680 | if (new_status == STAT_SECURE) | |
7d7b7b31 | 1681 | { |
7fa836e1 SK |
1682 | /* Reached a validated record, now try again at this level. |
1683 | Note that we may get ANOTHER NEED_* if an answer needs more than one key. | |
1684 | If so, go round again. */ | |
7d7b7b31 | 1685 | |
7fa836e1 SK |
1686 | if (status == STAT_NEED_KEY) |
1687 | new_status = dnssec_validate_by_ds(now, header, n, name, keyname, class); | |
00a5b5d4 SK |
1688 | else if (status == STAT_NEED_DS || status == STAT_NEED_DS_NEG) |
1689 | { | |
1690 | new_status = dnssec_validate_ds(now, header, n, name, keyname, class); | |
fe3992f9 SK |
1691 | if (status == STAT_NEED_DS) |
1692 | { | |
1693 | if (new_status == STAT_NO_DS) | |
1694 | new_status = STAT_INSECURE_DS; | |
1695 | else if (new_status == STAT_NO_NS) | |
1696 | new_status = STAT_BOGUS; /* Validated no DS */ | |
1697 | } | |
00a5b5d4 SK |
1698 | } |
1699 | else if (status == STAT_CHASE_CNAME) | |
1700 | new_status = dnssec_chase_cname(now, header, n, name, keyname); | |
1701 | else | |
1702 | { | |
97e618a0 | 1703 | new_status = dnssec_validate_reply(now, header, n, name, keyname, &class, NULL, NULL); |
00a5b5d4 SK |
1704 | |
1705 | if (new_status == STAT_NO_SIG) | |
1706 | { | |
1707 | if (option_bool(OPT_DNSSEC_NO_SIGN)) | |
1708 | new_status = tcp_check_for_unsigned_zone(now, header, n, class, name, keyname, server, keycount); | |
1709 | else | |
1710 | new_status = STAT_INSECURE; | |
1711 | } | |
1712 | } | |
1713 | ||
7d7b7b31 | 1714 | if (new_status == STAT_NEED_DS || new_status == STAT_NEED_KEY) |
7fa836e1 | 1715 | goto another_tcp_key; |
7d7b7b31 SK |
1716 | } |
1717 | } | |
fe3992f9 | 1718 | |
7fa836e1 SK |
1719 | free(packet); |
1720 | } | |
7d7b7b31 SK |
1721 | return new_status; |
1722 | } | |
1723 | #endif | |
1724 | ||
1725 | ||
feba5c1d SK |
1726 | /* The daemon forks before calling this: it should deal with one connection, |
1727 | blocking as neccessary, and then return. Note, need to be a bit careful | |
1728 | about resources for debug mode, when the fork is suppressed: that's | |
1729 | done by the caller. */ | |
5aabfc78 | 1730 | unsigned char *tcp_request(int confd, time_t now, |
4f7b304f | 1731 | union mysockaddr *local_addr, struct in_addr netmask, int auth_dns) |
feba5c1d | 1732 | { |
28866e95 SK |
1733 | size_t size = 0; |
1734 | int norebind = 0; | |
3b195961 | 1735 | #ifdef HAVE_AUTH |
19b16891 | 1736 | int local_auth = 0; |
3b195961 | 1737 | #endif |
613ad15d | 1738 | int checking_disabled, ad_question, do_bit, added_pheader = 0; |
fe3992f9 | 1739 | int check_subnet, no_cache_dnssec = 0, cache_secure = 0, bogusanswer = 0; |
cdeda28f | 1740 | size_t m; |
ee86ce68 SK |
1741 | unsigned short qtype; |
1742 | unsigned int gotname; | |
feba5c1d | 1743 | unsigned char c1, c2; |
4b5ea12e SK |
1744 | /* Max TCP packet + slop + size */ |
1745 | unsigned char *packet = whine_malloc(65536 + MAXDNAME + RRFIXEDSZ + sizeof(u16)); | |
1746 | unsigned char *payload = &packet[2]; | |
1747 | /* largest field in header is 16-bits, so this is still sufficiently aligned */ | |
1748 | struct dns_header *header = (struct dns_header *)payload; | |
1749 | u16 *length = (u16 *)packet; | |
3be34541 | 1750 | struct server *last_server; |
7de060b0 SK |
1751 | struct in_addr dst_addr_4; |
1752 | union mysockaddr peer_addr; | |
1753 | socklen_t peer_len = sizeof(union mysockaddr); | |
25cf5e37 SK |
1754 | int query_count = 0; |
1755 | ||
7de060b0 SK |
1756 | if (getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) == -1) |
1757 | return packet; | |
c8a80487 SK |
1758 | |
1759 | /* We can be configured to only accept queries from at-most-one-hop-away addresses. */ | |
1760 | if (option_bool(OPT_LOCAL_SERVICE)) | |
1761 | { | |
1762 | struct addrlist *addr; | |
1763 | #ifdef HAVE_IPV6 | |
1764 | if (peer_addr.sa.sa_family == AF_INET6) | |
1765 | { | |
1766 | for (addr = daemon->interface_addrs; addr; addr = addr->next) | |
1767 | if ((addr->flags & ADDRLIST_IPV6) && | |
1768 | is_same_net6(&addr->addr.addr.addr6, &peer_addr.in6.sin6_addr, addr->prefixlen)) | |
1769 | break; | |
1770 | } | |
1771 | else | |
1772 | #endif | |
1773 | { | |
1774 | struct in_addr netmask; | |
1775 | for (addr = daemon->interface_addrs; addr; addr = addr->next) | |
1776 | { | |
15b1b7e9 | 1777 | netmask.s_addr = htonl(~(in_addr_t)0 << (32 - addr->prefixlen)); |
c8a80487 SK |
1778 | if (!(addr->flags & ADDRLIST_IPV6) && |
1779 | is_same_net(addr->addr.addr.addr4, peer_addr.in.sin_addr, netmask)) | |
1780 | break; | |
1781 | } | |
1782 | } | |
1783 | if (!addr) | |
1784 | { | |
1785 | my_syslog(LOG_WARNING, _("Ignoring query from non-local network")); | |
1786 | return packet; | |
1787 | } | |
1788 | } | |
7de060b0 | 1789 | |
feba5c1d SK |
1790 | while (1) |
1791 | { | |
25cf5e37 SK |
1792 | if (query_count == TCP_MAX_QUERIES || |
1793 | !packet || | |
feba5c1d SK |
1794 | !read_write(confd, &c1, 1, 1) || !read_write(confd, &c2, 1, 1) || |
1795 | !(size = c1 << 8 | c2) || | |
4b5ea12e | 1796 | !read_write(confd, payload, size, 1)) |
feba5c1d SK |
1797 | return packet; |
1798 | ||
572b41eb | 1799 | if (size < (int)sizeof(struct dns_header)) |
feba5c1d SK |
1800 | continue; |
1801 | ||
25cf5e37 SK |
1802 | query_count++; |
1803 | ||
1804 | /* log_query gets called indirectly all over the place, so | |
1805 | pass these in global variables - sorry. */ | |
1806 | daemon->log_display_id = ++daemon->log_id; | |
1807 | daemon->log_source_addr = &peer_addr; | |
1808 | ||
ed4c0767 SK |
1809 | check_subnet = 0; |
1810 | ||
28866e95 | 1811 | /* save state of "cd" flag in query */ |
7d7b7b31 SK |
1812 | if ((checking_disabled = header->hb4 & HB4_CD)) |
1813 | no_cache_dnssec = 1; | |
28866e95 | 1814 | |
3be34541 | 1815 | if ((gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype))) |
feba5c1d | 1816 | { |
b485ed97 SK |
1817 | #ifdef HAVE_AUTH |
1818 | struct auth_zone *zone; | |
1819 | #endif | |
610e782a | 1820 | char *types = querystr(auth_dns ? "auth" : "query", qtype); |
7de060b0 SK |
1821 | |
1822 | if (peer_addr.sa.sa_family == AF_INET) | |
1823 | log_query(F_QUERY | F_IPV4 | F_FORWARD, daemon->namebuff, | |
1824 | (struct all_addr *)&peer_addr.in.sin_addr, types); | |
feba5c1d | 1825 | #ifdef HAVE_IPV6 |
7de060b0 SK |
1826 | else |
1827 | log_query(F_QUERY | F_IPV6 | F_FORWARD, daemon->namebuff, | |
1828 | (struct all_addr *)&peer_addr.in6.sin6_addr, types); | |
feba5c1d | 1829 | #endif |
b485ed97 SK |
1830 | |
1831 | #ifdef HAVE_AUTH | |
1832 | /* find queries for zones we're authoritative for, and answer them directly */ | |
6008bdbb SK |
1833 | if (!auth_dns) |
1834 | for (zone = daemon->auth_zones; zone; zone = zone->next) | |
1835 | if (in_zone(zone, daemon->namebuff, NULL)) | |
1836 | { | |
1837 | auth_dns = 1; | |
1838 | local_auth = 1; | |
1839 | break; | |
1840 | } | |
b485ed97 | 1841 | #endif |
feba5c1d SK |
1842 | } |
1843 | ||
7de060b0 SK |
1844 | if (local_addr->sa.sa_family == AF_INET) |
1845 | dst_addr_4 = local_addr->in.sin_addr; | |
1846 | else | |
1847 | dst_addr_4.s_addr = 0; | |
1848 | ||
4820dce9 | 1849 | #ifdef HAVE_AUTH |
4f7b304f | 1850 | if (auth_dns) |
19b16891 | 1851 | m = answer_auth(header, ((char *) header) + 65536, (size_t)size, now, &peer_addr, local_auth); |
4f7b304f | 1852 | else |
4820dce9 | 1853 | #endif |
feba5c1d | 1854 | { |
4f7b304f SK |
1855 | /* m > 0 if answered from cache */ |
1856 | m = answer_request(header, ((char *) header) + 65536, (size_t)size, | |
613ad15d | 1857 | dst_addr_4, netmask, now, &ad_question, &do_bit); |
feba5c1d | 1858 | |
4f7b304f SK |
1859 | /* Do this by steam now we're not in the select() loop */ |
1860 | check_log_writer(NULL); | |
1861 | ||
1862 | if (m == 0) | |
feba5c1d | 1863 | { |
4f7b304f SK |
1864 | unsigned int flags = 0; |
1865 | struct all_addr *addrp = NULL; | |
1866 | int type = 0; | |
1867 | char *domain = NULL; | |
feba5c1d | 1868 | |
4f7b304f SK |
1869 | if (option_bool(OPT_ADD_MAC)) |
1870 | size = add_mac(header, size, ((char *) header) + 65536, &peer_addr); | |
ed4c0767 SK |
1871 | |
1872 | if (option_bool(OPT_CLIENT_SUBNET)) | |
1873 | { | |
1874 | size_t new = add_source_addr(header, size, ((char *) header) + 65536, &peer_addr); | |
1875 | if (size != new) | |
1876 | { | |
1877 | size = new; | |
1878 | check_subnet = 1; | |
1879 | } | |
1880 | } | |
1881 | ||
4f7b304f SK |
1882 | if (gotname) |
1883 | flags = search_servers(now, &addrp, gotname, daemon->namebuff, &type, &domain, &norebind); | |
1884 | ||
1885 | if (type != 0 || option_bool(OPT_ORDER) || !daemon->last_server) | |
1886 | last_server = daemon->servers; | |
1887 | else | |
1888 | last_server = daemon->last_server; | |
1889 | ||
1890 | if (!flags && last_server) | |
1891 | { | |
1892 | struct server *firstsendto = NULL; | |
8a9be9e4 | 1893 | #ifdef HAVE_DNSSEC |
703c7ff4 | 1894 | unsigned char *newhash, hash[HASH_SIZE]; |
63758384 | 1895 | if ((newhash = hash_questions(header, (unsigned int)size, daemon->namebuff))) |
8a9be9e4 | 1896 | memcpy(hash, newhash, HASH_SIZE); |
b37f8b99 TH |
1897 | else |
1898 | memset(hash, 0, HASH_SIZE); | |
8a9be9e4 | 1899 | #else |
4f7b304f | 1900 | unsigned int crc = questions_crc(header, (unsigned int)size, daemon->namebuff); |
8a9be9e4 | 1901 | #endif |
4f7b304f SK |
1902 | /* Loop round available servers until we succeed in connecting to one. |
1903 | Note that this code subtley ensures that consecutive queries on this connection | |
1904 | which can go to the same server, do so. */ | |
1905 | while (1) | |
feba5c1d | 1906 | { |
4f7b304f SK |
1907 | if (!firstsendto) |
1908 | firstsendto = last_server; | |
1909 | else | |
1910 | { | |
1911 | if (!(last_server = last_server->next)) | |
1912 | last_server = daemon->servers; | |
1913 | ||
1914 | if (last_server == firstsendto) | |
1915 | break; | |
1916 | } | |
1917 | ||
1918 | /* server for wrong domain */ | |
1919 | if (type != (last_server->flags & SERV_TYPE) || | |
b5ea1cc2 SK |
1920 | (type == SERV_HAS_DOMAIN && !hostname_isequal(domain, last_server->domain)) || |
1921 | (last_server->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP))) | |
7de060b0 SK |
1922 | continue; |
1923 | ||
4f7b304f | 1924 | if (last_server->tcpfd == -1) |
7de060b0 | 1925 | { |
4f7b304f SK |
1926 | if ((last_server->tcpfd = socket(last_server->addr.sa.sa_family, SOCK_STREAM, 0)) == -1) |
1927 | continue; | |
1928 | ||
e9828b6f KV |
1929 | #ifdef HAVE_CONNTRACK |
1930 | /* Copy connection mark of incoming query to outgoing connection. */ | |
1931 | if (option_bool(OPT_CONNTRACK)) | |
1932 | { | |
1933 | unsigned int mark; | |
1934 | struct all_addr local; | |
1935 | #ifdef HAVE_IPV6 | |
1936 | if (local_addr->sa.sa_family == AF_INET6) | |
1937 | local.addr.addr6 = local_addr->in6.sin6_addr; | |
1938 | else | |
1939 | #endif | |
1940 | local.addr.addr4 = local_addr->in.sin_addr; | |
1941 | ||
1942 | if (get_incoming_mark(&peer_addr, &local, 1, &mark)) | |
1943 | setsockopt(last_server->tcpfd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int)); | |
1944 | } | |
1945 | #endif | |
1946 | ||
4f7b304f SK |
1947 | if ((!local_bind(last_server->tcpfd, &last_server->source_addr, last_server->interface, 1) || |
1948 | connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1)) | |
1949 | { | |
1950 | close(last_server->tcpfd); | |
1951 | last_server->tcpfd = -1; | |
1952 | continue; | |
1953 | } | |
1954 | ||
7d7b7b31 SK |
1955 | #ifdef HAVE_DNSSEC |
1956 | if (option_bool(OPT_DNSSEC_VALID)) | |
1957 | { | |
613ad15d SK |
1958 | size_t new_size = add_do_bit(header, size, ((char *) header) + 65536); |
1959 | ||
2ecd9bd5 SK |
1960 | /* For debugging, set Checking Disabled, otherwise, have the upstream check too, |
1961 | this allows it to select auth servers when one is returning bad data. */ | |
1962 | if (option_bool(OPT_DNSSEC_DEBUG)) | |
1963 | header->hb4 |= HB4_CD; | |
613ad15d SK |
1964 | |
1965 | if (size != new_size) | |
1966 | added_pheader = 1; | |
1967 | ||
1968 | size = new_size; | |
7d7b7b31 SK |
1969 | } |
1970 | #endif | |
4f7b304f SK |
1971 | } |
1972 | ||
4b5ea12e | 1973 | *length = htons(size); |
1fc02680 SK |
1974 | |
1975 | /* get query name again for logging - may have been overwritten */ | |
1976 | if (!(gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype))) | |
1977 | strcpy(daemon->namebuff, "query"); | |
4f7b304f | 1978 | |
4b5ea12e | 1979 | if (!read_write(last_server->tcpfd, packet, size + sizeof(u16), 0) || |
4f7b304f | 1980 | !read_write(last_server->tcpfd, &c1, 1, 1) || |
7d7b7b31 SK |
1981 | !read_write(last_server->tcpfd, &c2, 1, 1) || |
1982 | !read_write(last_server->tcpfd, payload, (c1 << 8) | c2, 1)) | |
4f7b304f SK |
1983 | { |
1984 | close(last_server->tcpfd); | |
1985 | last_server->tcpfd = -1; | |
1986 | continue; | |
1987 | } | |
1988 | ||
1989 | m = (c1 << 8) | c2; | |
4f7b304f | 1990 | |
4f7b304f SK |
1991 | if (last_server->addr.sa.sa_family == AF_INET) |
1992 | log_query(F_SERVER | F_IPV4 | F_FORWARD, daemon->namebuff, | |
1993 | (struct all_addr *)&last_server->addr.in.sin_addr, NULL); | |
feba5c1d | 1994 | #ifdef HAVE_IPV6 |
4f7b304f SK |
1995 | else |
1996 | log_query(F_SERVER | F_IPV6 | F_FORWARD, daemon->namebuff, | |
1997 | (struct all_addr *)&last_server->addr.in6.sin6_addr, NULL); | |
feba5c1d | 1998 | #endif |
7d7b7b31 SK |
1999 | |
2000 | #ifdef HAVE_DNSSEC | |
2001 | if (option_bool(OPT_DNSSEC_VALID) && !checking_disabled) | |
2002 | { | |
7fa836e1 SK |
2003 | int keycount = DNSSEC_WORK; /* Limit to number of DNSSEC questions, to catch loops and avoid filling cache. */ |
2004 | int status = tcp_key_recurse(now, STAT_TRUNCATED, header, m, 0, daemon->namebuff, daemon->keyname, last_server, &keycount); | |
554b580e | 2005 | char *result, *domain = "result"; |
7fa836e1 | 2006 | |
fe3992f9 SK |
2007 | if (status == STAT_INSECURE_DS) |
2008 | { | |
2009 | /* We only cache sigs when we've validated a reply. | |
2010 | Avoid caching a reply with sigs if there's a vaildated break in the | |
2011 | DS chain, so we don't return replies from cache missing sigs. */ | |
2012 | status = STAT_INSECURE; | |
2013 | no_cache_dnssec = 1; | |
2014 | } | |
2015 | ||
7fa836e1 | 2016 | if (keycount == 0) |
150162bc SK |
2017 | { |
2018 | result = "ABANDONED"; | |
2019 | status = STAT_BOGUS; | |
2020 | } | |
7fa836e1 SK |
2021 | else |
2022 | result = (status == STAT_SECURE ? "SECURE" : (status == STAT_INSECURE ? "INSECURE" : "BOGUS")); | |
e66b4dff SK |
2023 | |
2024 | if (status == STAT_BOGUS && extract_request(header, m, daemon->namebuff, NULL)) | |
2025 | domain = daemon->namebuff; | |
554b580e SK |
2026 | |
2027 | log_query(F_KEYTAG | F_SECSTAT, domain, NULL, result); | |
7d7b7b31 | 2028 | |
7d7b7b31 | 2029 | if (status == STAT_BOGUS) |
fe3992f9 SK |
2030 | { |
2031 | no_cache_dnssec = 1; | |
2032 | bogusanswer = 1; | |
2033 | } | |
2034 | ||
7d7b7b31 SK |
2035 | if (status == STAT_SECURE) |
2036 | cache_secure = 1; | |
2037 | } | |
2038 | #endif | |
2039 | ||
2040 | /* restore CD bit to the value in the query */ | |
2041 | if (checking_disabled) | |
2042 | header->hb4 |= HB4_CD; | |
2043 | else | |
2044 | header->hb4 &= ~HB4_CD; | |
4f7b304f SK |
2045 | |
2046 | /* There's no point in updating the cache, since this process will exit and | |
2047 | lose the information after a few queries. We make this call for the alias and | |
2048 | bogus-nxdomain side-effects. */ | |
2049 | /* If the crc of the question section doesn't match the crc we sent, then | |
2050 | someone might be attempting to insert bogus values into the cache by | |
2051 | sending replies containing questions and bogus answers. */ | |
8a9be9e4 SK |
2052 | #ifdef HAVE_DNSSEC |
2053 | newhash = hash_questions(header, (unsigned int)m, daemon->namebuff); | |
2054 | if (!newhash || memcmp(hash, newhash, HASH_SIZE) != 0) | |
703c7ff4 SK |
2055 | { |
2056 | m = 0; | |
2057 | break; | |
2058 | } | |
8a9be9e4 SK |
2059 | #else |
2060 | if (crc != questions_crc(header, (unsigned int)m, daemon->namebuff)) | |
703c7ff4 SK |
2061 | { |
2062 | m = 0; | |
2063 | break; | |
2064 | } | |
8a9be9e4 SK |
2065 | #endif |
2066 | ||
2067 | m = process_reply(header, now, last_server, (unsigned int)m, | |
e66b4dff SK |
2068 | option_bool(OPT_NO_REBIND) && !norebind, no_cache_dnssec, cache_secure, bogusanswer, |
2069 | ad_question, do_bit, added_pheader, check_subnet, &peer_addr); | |
4f7b304f SK |
2070 | |
2071 | break; | |
2072 | } | |
feba5c1d | 2073 | } |
4f7b304f SK |
2074 | |
2075 | /* In case of local answer or no connections made. */ | |
2076 | if (m == 0) | |
2077 | m = setup_reply(header, (unsigned int)size, addrp, flags, daemon->local_ttl); | |
feba5c1d | 2078 | } |
feba5c1d | 2079 | } |
4f7b304f | 2080 | |
5aabfc78 | 2081 | check_log_writer(NULL); |
feba5c1d | 2082 | |
4b5ea12e SK |
2083 | *length = htons(m); |
2084 | ||
2085 | if (m == 0 || !read_write(confd, packet, m + sizeof(u16), 0)) | |
feba5c1d SK |
2086 | return packet; |
2087 | } | |
2088 | } | |
2089 | ||
1697269c | 2090 | static struct frec *allocate_frec(time_t now) |
9e4abcb5 | 2091 | { |
1697269c SK |
2092 | struct frec *f; |
2093 | ||
5aabfc78 | 2094 | if ((f = (struct frec *)whine_malloc(sizeof(struct frec)))) |
9e4abcb5 | 2095 | { |
1a6bca81 | 2096 | f->next = daemon->frec_list; |
1697269c | 2097 | f->time = now; |
832af0ba | 2098 | f->sentto = NULL; |
1a6bca81 | 2099 | f->rfd4 = NULL; |
28866e95 | 2100 | f->flags = 0; |
1a6bca81 SK |
2101 | #ifdef HAVE_IPV6 |
2102 | f->rfd6 = NULL; | |
3a237152 SK |
2103 | #endif |
2104 | #ifdef HAVE_DNSSEC | |
97bc798b | 2105 | f->dependent = NULL; |
3a237152 | 2106 | f->blocking_query = NULL; |
4619d946 | 2107 | f->stash = NULL; |
97e618a0 | 2108 | f->orig_domain = NULL; |
1a6bca81 SK |
2109 | #endif |
2110 | daemon->frec_list = f; | |
1697269c | 2111 | } |
9e4abcb5 | 2112 | |
1697269c SK |
2113 | return f; |
2114 | } | |
9e4abcb5 | 2115 | |
b5ea1cc2 | 2116 | struct randfd *allocate_rfd(int family) |
1a6bca81 SK |
2117 | { |
2118 | static int finger = 0; | |
2119 | int i; | |
2120 | ||
2121 | /* limit the number of sockets we have open to avoid starvation of | |
2122 | (eg) TFTP. Once we have a reasonable number, randomness should be OK */ | |
2123 | ||
2124 | for (i = 0; i < RANDOM_SOCKS; i++) | |
9009d746 | 2125 | if (daemon->randomsocks[i].refcount == 0) |
1a6bca81 | 2126 | { |
9009d746 SK |
2127 | if ((daemon->randomsocks[i].fd = random_sock(family)) == -1) |
2128 | break; | |
2129 | ||
1a6bca81 SK |
2130 | daemon->randomsocks[i].refcount = 1; |
2131 | daemon->randomsocks[i].family = family; | |
2132 | return &daemon->randomsocks[i]; | |
2133 | } | |
2134 | ||
9009d746 | 2135 | /* No free ones or cannot get new socket, grab an existing one */ |
1a6bca81 SK |
2136 | for (i = 0; i < RANDOM_SOCKS; i++) |
2137 | { | |
2138 | int j = (i+finger) % RANDOM_SOCKS; | |
9009d746 SK |
2139 | if (daemon->randomsocks[j].refcount != 0 && |
2140 | daemon->randomsocks[j].family == family && | |
2141 | daemon->randomsocks[j].refcount != 0xffff) | |
1a6bca81 SK |
2142 | { |
2143 | finger = j; | |
2144 | daemon->randomsocks[j].refcount++; | |
2145 | return &daemon->randomsocks[j]; | |
2146 | } | |
2147 | } | |
2148 | ||
2149 | return NULL; /* doom */ | |
2150 | } | |
b5ea1cc2 SK |
2151 | |
2152 | void free_rfd(struct randfd *rfd) | |
2153 | { | |
2154 | if (rfd && --(rfd->refcount) == 0) | |
2155 | close(rfd->fd); | |
2156 | } | |
2157 | ||
1a6bca81 SK |
2158 | static void free_frec(struct frec *f) |
2159 | { | |
b5ea1cc2 | 2160 | free_rfd(f->rfd4); |
1a6bca81 SK |
2161 | f->rfd4 = NULL; |
2162 | f->sentto = NULL; | |
28866e95 | 2163 | f->flags = 0; |
1a6bca81 SK |
2164 | |
2165 | #ifdef HAVE_IPV6 | |
b5ea1cc2 | 2166 | free_rfd(f->rfd6); |
1a6bca81 SK |
2167 | f->rfd6 = NULL; |
2168 | #endif | |
3a237152 SK |
2169 | |
2170 | #ifdef HAVE_DNSSEC | |
2171 | if (f->stash) | |
0fc2f313 SK |
2172 | { |
2173 | blockdata_free(f->stash); | |
2174 | f->stash = NULL; | |
2175 | } | |
3a237152 | 2176 | |
97e618a0 SK |
2177 | if (f->orig_domain) |
2178 | { | |
2179 | blockdata_free(f->orig_domain); | |
2180 | f->orig_domain = NULL; | |
2181 | } | |
2182 | ||
3a237152 SK |
2183 | /* Anything we're waiting on is pointless now, too */ |
2184 | if (f->blocking_query) | |
2185 | free_frec(f->blocking_query); | |
2186 | f->blocking_query = NULL; | |
39048ad1 | 2187 | f->dependent = NULL; |
3a237152 | 2188 | #endif |
1a6bca81 SK |
2189 | } |
2190 | ||
1697269c SK |
2191 | /* if wait==NULL return a free or older than TIMEOUT record. |
2192 | else return *wait zero if one available, or *wait is delay to | |
1a6bca81 | 2193 | when the oldest in-use record will expire. Impose an absolute |
3a237152 SK |
2194 | limit of 4*TIMEOUT before we wipe things (for random sockets). |
2195 | If force is set, always return a result, even if we have | |
2196 | to allocate above the limit. */ | |
2197 | struct frec *get_new_frec(time_t now, int *wait, int force) | |
1697269c | 2198 | { |
1a6bca81 | 2199 | struct frec *f, *oldest, *target; |
1697269c SK |
2200 | int count; |
2201 | ||
2202 | if (wait) | |
2203 | *wait = 0; | |
2204 | ||
1a6bca81 | 2205 | for (f = daemon->frec_list, oldest = NULL, target = NULL, count = 0; f; f = f->next, count++) |
832af0ba | 2206 | if (!f->sentto) |
1a6bca81 SK |
2207 | target = f; |
2208 | else | |
1697269c | 2209 | { |
1a6bca81 SK |
2210 | if (difftime(now, f->time) >= 4*TIMEOUT) |
2211 | { | |
2212 | free_frec(f); | |
2213 | target = f; | |
2214 | } | |
2215 | ||
2216 | if (!oldest || difftime(f->time, oldest->time) <= 0) | |
2217 | oldest = f; | |
1697269c | 2218 | } |
1a6bca81 SK |
2219 | |
2220 | if (target) | |
2221 | { | |
2222 | target->time = now; | |
2223 | return target; | |
2224 | } | |
9e4abcb5 SK |
2225 | |
2226 | /* can't find empty one, use oldest if there is one | |
2227 | and it's older than timeout */ | |
1697269c | 2228 | if (oldest && ((int)difftime(now, oldest->time)) >= TIMEOUT) |
9e4abcb5 | 2229 | { |
1697269c SK |
2230 | /* keep stuff for twice timeout if we can by allocating a new |
2231 | record instead */ | |
2232 | if (difftime(now, oldest->time) < 2*TIMEOUT && | |
2233 | count <= daemon->ftabsize && | |
2234 | (f = allocate_frec(now))) | |
2235 | return f; | |
2236 | ||
2237 | if (!wait) | |
2238 | { | |
1a6bca81 | 2239 | free_frec(oldest); |
1697269c SK |
2240 | oldest->time = now; |
2241 | } | |
9e4abcb5 SK |
2242 | return oldest; |
2243 | } | |
2244 | ||
1697269c | 2245 | /* none available, calculate time 'till oldest record expires */ |
3a237152 | 2246 | if (!force && count > daemon->ftabsize) |
1697269c | 2247 | { |
0da5e897 MSB |
2248 | static time_t last_log = 0; |
2249 | ||
1697269c SK |
2250 | if (oldest && wait) |
2251 | *wait = oldest->time + (time_t)TIMEOUT - now; | |
0da5e897 MSB |
2252 | |
2253 | if ((int)difftime(now, last_log) > 5) | |
2254 | { | |
2255 | last_log = now; | |
2256 | my_syslog(LOG_WARNING, _("Maximum number of concurrent DNS queries reached (max: %d)"), daemon->ftabsize); | |
2257 | } | |
2258 | ||
9e4abcb5 SK |
2259 | return NULL; |
2260 | } | |
1697269c SK |
2261 | |
2262 | if (!(f = allocate_frec(now)) && wait) | |
2263 | /* wait one second on malloc failure */ | |
2264 | *wait = 1; | |
9e4abcb5 | 2265 | |
9e4abcb5 SK |
2266 | return f; /* OK if malloc fails and this is NULL */ |
2267 | } | |
2268 | ||
832af0ba | 2269 | /* crc is all-ones if not known. */ |
8a9be9e4 | 2270 | static struct frec *lookup_frec(unsigned short id, void *hash) |
9e4abcb5 SK |
2271 | { |
2272 | struct frec *f; | |
2273 | ||
1a6bca81 | 2274 | for(f = daemon->frec_list; f; f = f->next) |
832af0ba | 2275 | if (f->sentto && f->new_id == id && |
8a9be9e4 | 2276 | (!hash || memcmp(hash, f->hash, HASH_SIZE) == 0)) |
9e4abcb5 SK |
2277 | return f; |
2278 | ||
2279 | return NULL; | |
2280 | } | |
2281 | ||
2282 | static struct frec *lookup_frec_by_sender(unsigned short id, | |
fd9fa481 | 2283 | union mysockaddr *addr, |
8a9be9e4 | 2284 | void *hash) |
9e4abcb5 | 2285 | { |
feba5c1d SK |
2286 | struct frec *f; |
2287 | ||
1a6bca81 | 2288 | for(f = daemon->frec_list; f; f = f->next) |
832af0ba | 2289 | if (f->sentto && |
9e4abcb5 | 2290 | f->orig_id == id && |
8a9be9e4 | 2291 | memcmp(hash, f->hash, HASH_SIZE) == 0 && |
9e4abcb5 SK |
2292 | sockaddr_isequal(&f->source, addr)) |
2293 | return f; | |
2294 | ||
2295 | return NULL; | |
2296 | } | |
47a95169 SK |
2297 | |
2298 | /* Send query packet again, if we can. */ | |
2299 | void resend_query() | |
2300 | { | |
2301 | if (daemon->srv_save) | |
2302 | { | |
2303 | int fd; | |
2304 | ||
2305 | if (daemon->srv_save->sfd) | |
2306 | fd = daemon->srv_save->sfd->fd; | |
2307 | else if (daemon->rfd_save && daemon->rfd_save->refcount != 0) | |
2308 | fd = daemon->rfd_save->fd; | |
2309 | else | |
2310 | return; | |
2311 | ||
ff841ebf SK |
2312 | while(retry_send(sendto(fd, daemon->packet, daemon->packet_len, 0, |
2313 | &daemon->srv_save->addr.sa, | |
2314 | sa_len(&daemon->srv_save->addr)))); | |
47a95169 SK |
2315 | } |
2316 | } | |
9e4abcb5 | 2317 | |
849a8357 | 2318 | /* A server record is going away, remove references to it */ |
5aabfc78 | 2319 | void server_gone(struct server *server) |
849a8357 SK |
2320 | { |
2321 | struct frec *f; | |
2322 | ||
1a6bca81 | 2323 | for (f = daemon->frec_list; f; f = f->next) |
832af0ba | 2324 | if (f->sentto && f->sentto == server) |
1a6bca81 | 2325 | free_frec(f); |
849a8357 SK |
2326 | |
2327 | if (daemon->last_server == server) | |
2328 | daemon->last_server = NULL; | |
2329 | ||
2330 | if (daemon->srv_save == server) | |
2331 | daemon->srv_save = NULL; | |
2332 | } | |
9e4abcb5 | 2333 | |
316e2730 | 2334 | /* return unique random ids. */ |
8a9be9e4 | 2335 | static unsigned short get_id(void) |
9e4abcb5 SK |
2336 | { |
2337 | unsigned short ret = 0; | |
832af0ba | 2338 | |
316e2730 | 2339 | do |
832af0ba | 2340 | ret = rand16(); |
8a9be9e4 | 2341 | while (lookup_frec(ret, NULL)); |
832af0ba | 2342 | |
9e4abcb5 SK |
2343 | return ret; |
2344 | } | |
2345 | ||
2346 | ||
2347 | ||
2348 | ||
2349 |